“I don’t,” I say. “And Melanie has the A average, and I have the C, so maybe I should go on a few benders and things will even out. Maybe that’s a much better idea than this stupid study hall you have me in.”

I’m really into this now, which is kind of crazy, because I don’t even want a beer. One of the few things I like about this restaurant is the virgin margaritas—they’re made with fresh fruit.

Mom turns to me, her mouth ready to catch some flies. “Allyson, do you have a drinking problem?”

I smack my hand to my head. “Mother, do you have a hearing problem? Because I don’t know that you heard a word I said.”

“I think she’s saying that you might ease up a little and let them have a beer with dinner,” Susan says.

“Thank you!” I say to Susan.

My mom looks to my dad. “Let the girls have a beer,” he says expansively as he waves the waiter back over and asks for a couple of Tecates.

It’s a victory of sorts. Except that I don’t actually like beer, so in the end, I have to pretend to sip from mine as it grows sweaty on the table, and I don’t order the virgin margarita I really wanted.

The next day, Melanie and I are sitting at the giant pool together. It’s the first time we’ve managed to be alone since we got here.

“I think we should do something different,” she says.

“Me too,” I say. “Every year we come down here and we do the same things. We go to the same frigging ruins, even. Tulum is nice, but I was thinking we could branch out. Talk our parents into going somewhere new.”

“Like swimming with the dolphins?” Melanie asks.

Dolphin swimming is different, but it’s not what I’m after. Yesterday, I was looking at the map of the Yucatán Peninsula in the lobby, and some of the ruins are inland, more off the beaten path. Maybe we’d find a bit more of the real Mexico. “I was thinking we could go to Coba or Chichén Itzá. Different ruins.”

“Oh, you’re so wild,” Melanie teases. She takes a slurp of iced tea. “Anyhow, I’m talking about New Year’s Eve.”

“Oh. You mean you don’t want to do the Macarena with Johnny Maximo?” Johnny Maximo is this washed-up Mexican movie star who now has some job with the resort. All the mothers love him because he’s handsome and macho and is always pretending to mistake them for our sisters.

“Anything but the Macarena!” Melanie puts down her book, something by Rita Mae Brown that looks like it’s for school but Melanie says is not. “One of the bartenders told me about some big party on the beach in Puerto Morelos. It’s a local thing, though he says lots of tourists come, but people like us. Young people. There’s going to be a Mexican reggae band, which sounds bizarre. In a good way.”

“You’re just looking for a guy under sixty to make out with come midnight.”

Melanie shrugs. “Under sixty, yes. A guy? Maybe not.” She gives me a look.

“What?”

“I’ve sort of being doing the girl thing.”

“What?!” It comes out a shout. “Sorry. Since when?”

“Since right after Thanksgiving. There was this one girl and we met in film theory class and we were friends and one night we went out and it just happened.”

I look at the new haircut, the nose ring, the hairy armpits. It all makes sense. “So, are you a lesbian now?”

“I prefer not to label it,” she says, somewhat sanctimoniously, the implication being that I need to label everything. She’s the one who’s constantly branding herself: Mel, Mel 2.0. Punk-rock librarian. I ask her girlfriend’s name. She tells me they’re not into defining it like that, but her name is Zanne.

“Is that with an X?”

“Z. Short for Suzanne.”

Doesn’t anybody use a real name anymore?

“Don’t tell my parents, okay? You know my mom. She’d make us process it and talk about it as a phase of my development. I want to make sure this is more than a fling before I subject myself to that.”

“Please, you don’t have to tell me about parental overanalysis.”

She pushes her sunglasses up her nose and turns to me. “Yeah, so what’s that all about?”

“What do you mean? You’ve met my parents. Is there a part of my life they’re not involved in? They must be freaking out to not have their fingers literally in every aspect of what I’m doing.”

“I know. And when I heard about the study hall, I figured it was that. I thought maybe you had a low B average. But a two—point—seven? Really?”

“Don’t you start on me.”

“I’m not. I’m just surprised. You’ve always been such a kick-ass student. I don’t get it.” She takes a loud slurp of her mostly melted iced tea. “The Therapist says you’re depressed.”

“Your mom? She told you that?”

“I heard her mention it to your mom.”

“What did my mom say?”

“That you weren’t depressed. That you were pouting because you weren’t used to being punished. Sometimes I really want to smack your mom.”

“You and me both.”

“Anyhow, later on my mom asked me if I thought you were depressed.”

“And what’d you tell her?”

“I said lots of people have a hard time freshman year.” She gives me a sharp look from behind her dark glasses. “I couldn’t tell her the truth, could I? That I thought you were still pining for some guy you had a one-night stand with in Paris.”

I pause, listening to the shriek of a little kid jumping off the high dive. When Melanie and I were little, we used to hold hands and jump together, over and over again.

“But what if it’s not him? Not Willem.” It’s weird saying his name out loud. Here. After embargoing it for so long. Willem. I scarcely even allow myself to think it in my head.

“Don’t tell me another guy dicked you over!”

“No! I’m talking about me.”

“You?”

“It’s, like, the me I was that day. I was different somehow.”

“Different? How?”

“I was Lulu.”

“But that was just a name. Just pretend.”

Maybe it was. But still, that whole day, being with Willem, being Lulu, it made me realize that all my life I’ve been living in a small, square room, with no windows and no doors. And I was fine. I was happy, even. I thought. Then someone came along and showed me there was a door in the room. One that I’d never even seen before. Then he opened it for me. Held my hand as I walked through it. And for one perfect day, I was on the other side. I was somewhere else. Someone else. And then he was gone, and I was thrown back into my little room. And now, no matter what I do, I can’t seem to find that door.

“It didn’t feel pretend,” I tell Melanie.

Melanie arranges her face in sympathy. “Oh, sweetie. It’s because you were all hopped up on the fumes of infatuation. And Paris. But people don’t change overnight. Especially you. You’re Allyson. You’re so solid. It’s one of the things I love about you—how reliably you are.”

I want to protest. What about transformations? What about the reinvention she’s always going on about? Are those only reserved for her? Is there a different standard for me?

“You know what you need? Some Ani DeFranco.” She pulls out her iPhone and shoves the buds in my ears, and as Ani goes on about finding your voice and making it heard, I feel so frustrated with myself. Like I want to pull my skin wide open and step out of it. I scrape my feet against the hot cement floor and sigh, wishing there was someone I could explain this to. Someone who might understand what I’m feeling.

And for one small second, I do imagine the person I could talk to, about finding this door, and losing it. He would understand.

But that’s the one door that needs to stay shut.

Eighteen

Somehow, using the same we’re-adults-you-have-to-treat-us-that-way argument from the Beer Dinner, plus promising to hire a hotel-approved taxi for the entire night, Melanie and I manage to procure parental permission to go to that New Year’s Eve party. It’s being held on a narrow crescent of sand, all lit up with tiki torches, and at ten o’clock, it’s already slamming. There is a low stage on which the touted Mexican reggae band will play, though right now a d.j. is playing techno.

There are several giant piles of discarded shoes. Melanie tosses off her bright-orange flip-flops. I hesitate before taking off my less conspicuous black leather sandals, hoping I’ll find them again, because if I lose anything else, I swear I will never hear the end of it.

“Quite the bacchanal,” Melanie says approvingly, nodding to the guys in swim trunks holding bottles of tequila by the neck, the girls in sarongs with their hair freshly cornrowed. There are even actual Mexicans here, the guys smartly dressed in sheer white shirts, hair slicked back, and the girls in fancy party dresses, cut up to there, legs long and brown.

“Dance first or drink first?”

I don’t want to dance. So I say drink. We line up at the packed bar. Behind us is a group of French-speaking people, which makes me do a double take. There’s hardly anyone but Americans at our hotel, but of course people from everywhere come to Mexico.

“Here.” Melanie shoves a drink into my hand. It’s in a hollowed-out piece of pineapple. I take a sniff. It smells like suntan lotion. It is sweet and warm and burns slightly going down. “Good girl.”

I think of Ms. Foley. “Don’t call me that.”

“Bad girl.”

“I’m not that either.”

She looks peeved. “Nothing girl.”

We drink our drinks in silence, taking in the growing party. “Let’s dance,” Melanie says, yanking me toward the ring of sand that has been allocated as the dance floor.

I shake my head. “Maybe later.”

And there’s that sigh again. “Are you going to be like this all night?”

“Like what?” I think of what she called me on the tour—adventure averse—and what she said at the pool. “So like me? I thought that’s what you loved about me.”

“What is your problem? You’ve had a stick up your ass this whole trip! It’s not my fault your mom is Study-Hall Nazi.”

“No, but it is your fault for making me feel like crap because I don’t want to dance. I hate techno. I have always hated techno, so you should know that, what with me being so reliably me.”

“Fine. Why don’t you be reliably you and sit on the sidelines while I dance.”

“Fine.”

She leaves me on the perimeter of the circle and goes off and just starts dancing with random people. First she dances with some guy with dreadlocks and then turns and dances with a girl with super-short hair. She seems to be having a fine time out there, swirling, twirling, and it strikes me that if I didn’t already know her, she would no longer be someone I would know.

I watch her for at least twenty minutes. In between the monotonous techno songs, she talks to other people, laughs. After a half hour, I’m getting a headache. I try to catch her eye, but I eventually give up and slip away.