Kriminologen Fredrika Bergman ansættes som civil efterforsker i Stockholms politi, men bliver ikke ligefrem modtaget med åbne arme. Samtidig bortføres en lille pige fra sin mor på byens hovedbanegård. Mistanken retter sig mod pigens far, og alle kræfter sættes ind på at finde ham.

Tragedy strikes, another child goes missing and Fredrika, Alex and the others have a race against time to find the serial offender before any more children are harmed.

A priest and his wife, who work with refugees, are murdered in their home and a series of robberies is linked to the murders, but how and why? Meanwhile, Alex's marriage is in trouble.

To jødiske drenge bortføres. Fredrika er gravid i syvende måned, men sagen kaster en skygge over hendes glæde. Det hjælper ikke, at drengenes forældre beskylder hinanden for at være skyld i bortførelsen.

An Israeli legend tells of the Paper Boy who comes alive at night and takes his victims. What initially appears to be a racist hate crime seems like it could be connected to this myth. He is alive again and wants revenge.

En kvindelig studerende har været forsvundet i to år. Nu findes hun begravet på en byggeplads. Snart gøres der flere fund på gerningsstedet - her findes der hemmeligheder, som er flere årtier gamle.

Fredrika's private life is dragged into the investigation when Spencer is implicated. Meanwhile, Peder's brother sees more than he should and takes off, and developments in the case prove fatal.

En mand, der er blevet frikendt for mord, findes dræbt i sit hjem. Snart dukker der flere lig op af mennesker, der har undgået retsforfølgelse for forskellige forbrydelser. Nogen synes at være ude efter hævn, og Fredrikas gruppe må indse, at de står over for deres hidtil farligste modstander.

Peder tries to get back on the investigation team as the body count mounts but he is not accepted any more. A dangerous killer is at large: could an insider be involved?