A baffling mystery sets an FBI agent on a dangerous path . . .

Park rangers are puzzled when a child is found wandering alone in the middle of a forest near Seattle.

Stranger still, he speaks a peculiar language that sounds a little like German and is dressed in clothes people wore in the Middle Ages.

With no one having reported him missing, FBI Special Agent Will McCord assembles a dedicated unit to investigate the case, placing Detective Ilona Farris at its head.

Their relationship is edgy. They used to be an item. But McCord knows Farris is the best person for the job. Especially when more children turn up in similar circumstances.

Farris isn't convinced that she is in fact the right person. Memories of a traumatic incident in her own childhood begin to emerge and threaten to cloud her judgement.

Can she bury her demons and solve the mystery of these children, seemingly lost in time?