One morning, ten-year-old Thomas's mother tells him about a dream she had about taking a trip by herself. That seems strange, because lately, his mother has been too depressed to even leave the house. Maybe it's a good sign.

But when Thomas gets home from school, she's gone. The police search everywhere, and although they find her car, they can't find her. Without any clear answers, Thomas will have to find his own.

With the help of his friends-- and a shared story they create to explain what has happened, a fantasy involving a perilous quest only his mother can complete-- Thomas finds a way to work through his anxiety and grief, reach out to his father, and recognize that even if his mother never comes back, he can still hold a place for her in his heart and mind.

This heartbreaking, beautiful novel about loss and grief explores the ways in which young people must face unimaginable tragedies-- and how imagination and compassion can bring some light to the days after.