I knew why all this was necessary, of course. Usually, I didn’t let it bother me. But Katarina could tell that Ashley’s superior attitude had gotten under my skin. My silence the following days must have cut through her, because to my surprise she bought us two round-trip airline tickets to Denver. The destination didn’t matter – she knew I just wanted the experience.

I couldn’t wait to tell Ashley.

But on the day of the trip, standing outside the airport, Katarina hesitated. She seemed nervous. She ran her hand through her short black hair. She had dyed and cut it the night before, just before making herself a new ID. A family of five walked around us on the curb, dragging heavy luggage, and to my left a tearful mother said good-bye to her two young daughters. I wanted nothing more than to join in, to be a part of this everyday scene. Katarina watched everyone around us while I fidgeted impatiently by her side.

‘No,’ Katarina finally said. ‘We’re not going. I’m sorry, Veronica, but it’s not worth it.’

We drove home in silence, letting the screaming engines of the planes passing overhead speak for us. When we got out of the car on our street, I saw Ashley sitting on her front steps. She looked at me walking towards our house and mouthed the word liar . The humiliation was almost too much to bear.

But, really, I was a liar. It’s ironic. Lying was all I had done since I’d arrived on Earth. My name, where I was from, where my father was, why I couldn’t stay the night at another girl’s house – lying was all I knew and it was what kept me alive. But when Ashley called me a liar the one time I was telling someone the truth, I was unspeakably angry. I stormed up to my room, slammed the door, and punched the wall.

To my surprise, my fist went straight through.

Katarina slammed my door open, wielding a kitchen knife and ready to strike. She thought the noise she’d heard must be Mogs. When she saw what I had done to the wall, she realized that something had changed with me. She lowered the blade and smiled. ‘Today’s not the day you get on a plane, but it is the day you’re going to start your training.’

Seven years later, sitting on this plane with Marina and Ella, I hear Katarina’s voice in my head. ‘We’d be trapped up there .’ But I’m ready for that possibility now, in ways that Katarina and I weren’t.