In the middle of a rainy Swedish summer, a little girl is abducted from a crowded train.

Her distraught mother, left behind at the previous station, alerts the crew immediately. But despite hundreds of potential witnesses, the only trace of her is a pair of shoes.

To the Stockholm police this looks like a classic custody row. But none of the evidence adds up and young Investigative Analyst Fredrika Bergman is convinced the case is more complex than her boss is prepared to admit.

So when the missing child is found dead in the far north of Sweden, with the word UNWANTED scribbled on her forehead, the rule book is finally thrown out of the window. Now on the trail of a ruthless murderer with a terrifying agenda, will Fredrika and the team be able to put aside their differences and work together to find the killer, before it's too late?