Eight-year-old Brooklyn Mercer has gone missing. And as accustomed as FBI agents Eliza Sterling and Brandon Eddison are to such harrowing cases, this one has struck a nerve. It marks the anniversary of the disappearance of Eddison’s own little sister. Disturbing, too, is the girl’s resemblance to Eliza―so uncanny they could be mother and daughter.

With Eddison’s unsettled past rising again with rage and pain, Eliza is determined to solve this case at any cost. But the closer she looks, the more reluctant she is to divulge to her increasingly shaken partner what she finds. Brooklyn isn’t the only girl of her exact description to go missing. She’s just the latest in a frightening pattern going back decades in cities throughout the entire country.