Since sixteen-year-old Riley Strout lost her mother two years ago, her survival has depended on the quirky little family formed from a grief support group at school. Jay, Kate, and Noah understand her pain; each lost a loved one. The four have stuck together in spite of their differences, united by tragedies only they understand. When Riley sees her mother shopping in a grocery store, she fears she is suffering from some sort of posttraumatic stress episode--until Jay and Kate report similar visions. Noah is the only one who hasn't shared their experience. He withdraws from the others, skeptical and distant, and then suddenly disappears. Riley fears the worst. As she, Jay, and Kay frantically search for their missing friend, they are drawn into the mystery surrounding a famous relic that belonged to Jay's father--something that may contain clues about the afterlife. And in reaching for the ones who are gone, Riley uncovers hidden truths about those she hasn't yet lost. From the Hardcover edition.