Missing persons investigator Brenna Spector has a rare neurological disorder that enables her to recall every detail of every day of her life. It began in childhood, when her older sister stepped into a strange car never to be seen again and it's proven invaluable in her work. But it hasn't helped her to solve the mystery that haunts her above all others - and it didn't lead her to six-year-old Iris Neff, who walked away from a barbecue in her small suburban town more than a decade ago and vanished. When a local woman, Carol Wentz, disappears eleven years later, Brenna uncovers bizarre connections between the missing woman, the long-gone girl...and herself.