Nora Sand, on suspension after a scandal, is sent an envelope anonymously; inside are previously unseen photos of teenage girls who vanished years before; Nora's instincts kick in.

Nora meets skepticism and resistance from the local press and the police; she begins to focus her investigation on a person who was on the ferry with the missing girls; is she on the right track?

Nora looks for answers in the case of the missing girls.

Nora receives an unexpected call from a British investigator; Bill Hix is serving a life sentence, convicted of several murders on young women in England; he says he has new information about the missing Danish girls.

When the DNA test results from the remains found in England come back, everyone is baffled; Nora begins to pursue new leads suggesting that Hix may have an accomplice.

In Denmark, crime scene work and technical evidence provide concrete proof that a serial killer is at large; what are the connections with the original cold case?