I pushed Callum in front of me. We skidded across the ice, arms windmilling. Callum reached for the door.

"It's you," Ica said. "I recognize you from somewhere."

Callum grabbed the handle and shoved.

"It's you, isn't it?"

Something whipped around my leg and yanked it from under me. I landed hard on the ice, and all my air whooshed out. Gretchen's picture slipped from my grip, clattered to the floor, and slid away.

"Leigh!" Callum's hands ...