With a baby on the way, a pregnant wife to take care of and a new home to settle into, DCI Craig Gillard seems to have found a life of domestic bliss.

But when retired police sergeant Ken Stapleford is found stabbed to death in front of his own TV while watching Saturday afternoon football, Gillard's peace is once again disturbed.

Only a day later, just a short walk from his new home, Gillard is himself witness to the killing of a jogger in Nightingale Park. A strange forensic connection emerges between the two killings, something that seems impossible. As he digs into the evidence, Gillard uncovers two more attacks, and any chance of taking time off for the birth of his child disappears.

And all the time the killer is circling closer and closer...