“Hannah!”

“What?” I called, not taking my eyes off my Spanish homework. God. I couldn’t understand this stuff for the life of me.

Dallas appeared in my doorway, her head bobbing up and down to whatever she was blasting on her iPod. My identical twin, she’d look almost exactly like me if it wasn’t for her heavy eyeliner and black skinny jeans.

“Hey.” Dallas moved to the edge of my bed and gazed at my Spanish homework. “Change that to nosotros,” she instructed, tapping my paper.

“Thanks.”

She nodded and yanked her earphones out of her ears. “So. What’s up? You want a snack?” Dallas reached into her deep hoodie pocket and flung a miniature pack of M’n’M’s at me.

“Sweet,” I grinned and glanced at the clock. It was nearly six-thirty. “Where did Dad say he was going?”

Dallas shrugged. “Don’t know, don’t care. You know he’s always out late.”

I nodded, but I still felt uneasy.

And that’s when we first heard the sirens.