The First DS Ian Peterson Murder Investigation When Henry's wife is stabbed to death, he pays a prostitute to give him an alibi. Her body is discovered, strangled, and the police realise they are dealing with a serial killer who will stop at nothing to cover his tracks. While they are hunting for evidence, another prostitute is brutally murdered. On the track of a vicious killer, Ian doesn't realise he is risking the life of his young colleague, Polly. Already established as a popular character in his own right, Ian Peterson appears in a supporting role in the first three Geraldine Steel novels. Cold Sacrifice is the start of his own career as protagonist in a brand new detective series.