Cold sacrifice - Leigh Russell

When three dead bodies are discovered in quick succession on his home patch in Kent, DI Ian Peterson becomes too embroiled in a complex murder investigation to worry about his forthcoming promotion or the state of his marriage. The first victim is a middle class housewife, stabbed to death in a park. Her husband is in the clear until the prostitute who provided him with an alibi is murdered. While the police are busy gathering evidence, a second prostitute is killed. Ian and a young female constable, Polly, struggle to make sense of the case and find the elusive killer.