DCI Norton dismisses Sam's idea that a serial killer is at work - until a third body is found at one of the victim's family homes.

A third death helps Sam realise that the motive behind the murders of the Davies brothers was not racial - but revenge.

Sam is called in to identify the naked body of a woman uncovered on a ski slope in Norway.

A second post-mortem is perfumed on Helen Dupen and, although Sam is obviously ill, she is determined to find more evidence.

Two elderly brothers are found dead in their home, with no apparent injuries. A post mortem discovers suspicious puncture marks and a possible racist connection.

A school director's wife commits suicide, but Sam suspects murder. During the investigation, she receives shocking news about her own health.