Forgotten LIves: A DCI Stirling Investigation

A man is murdered with quiet efficiency on his doorstep. A strange emblem left behind suggests a gang killing but when more bodies are found with the same emblem, and one of them a cop, DCI Doug Stirling's investigation takes a sinister turn. But what linked the victims in life, and now in death? When more deaths are uncovered, miles away and years apart, but all with the same emblem left behind, pressure mounts on Stirling. Is it the work of the same person? If so, why are they killing aga...