Charles suffers another blow when the Army refuses his application to return to active service. He drifts to London, where he pursues a rootless and unsociable existence plagued by migraines and punctuated with episodes of violence. In a Bermondsey pub, a 250-lb lesbian weightlifter named Jackson puts a stop to his attack on an innocent customer with the wrong skin colour. Unfortunately the incident also brings Charles to the attention of the police. There is a murder enquiry in the area, and he fits the psychological profile of the killer.

Three mature homosexual men have been bludgeoned to death in their own homes. Charles was in London, and without an alibi, at the time of each murder. As the evidence against him mounts, he is forced to turn for help to Jackson, who happens to be a GP and ideally placed to probe the mysteries of Charles’s damaged mind.

Walters has the knack of focussing on an intriguing psychological condition or relationship and using it as the thematic spine of her novels. Her characters ring true whether she’s dealing with a career-obsessed young army officer, a teenage thief or a dirty old man edging towards senility. The narrative is typically suspenseful, driven not so much by the hunt for the murderer as by the investigation into Charles’s motivation.

Sometimes the contrivances under-pinning the plot seem a little too obvious. But perhaps even this is intentional: after all, Charles’s Birmingham psychiatrist meditates on the Jungian concept of synchronicity, the acausal connecting principle; and, as the title suggests, there is more than a dash of Jungian thinking in the novel as a whole. And a few coincidences are a small price to pay for a disturbing and fascinating thriller.

Andrew Taylor’s latest novel is Naked to the Hangman (Hodder).

Blackwell Bookshop

Purchase your copy here, 10% off RRP