Seventeen-year-old Steve and Mary gradually realize their strange sensations are glimpses of another world in the same time and space - a world they must choose to enter or lose forever.
This book was based on a really interesting idea - shifting between parallel lives/universes - but it felt like only half a story. Events would move strangely quickly, with large gaps in between, which made it somewhat confusing and didn't really leave time to feel connected to the story or characters.