A Mind to Murder - P. D. James

In this second mystery featuring Scotland Yard investigator Adam Dalgliesh, the administrative head of the Steen Psychiatric Clinic is found dead with a chisel in her heart and a weird, wooden phallic symbol in her arms.
The second book to feature Scotland Yard investigator Adam Dalgliesh, A Mind To Murder is a "superbly satisfying mystery" (Chicago Daily News) from bestselling author P.D. James.

On the surface, the Steen Psychiatric Clinic is one of the most reputable institutions in London. But when the administrative head is found dead with a chisel in her heart, that distinguished facade begins to crumble as the truth emerges. Superintendent Adam Dalgliesh of Scotland Yard is called in to investigate and quickly finds himself caught in a whirlwind of psychiatry, drugs, and deceit. Now he must analyze the deep-seated anxieties and thwarted desires of patients and staff alike to determine which of their unresolved conflicts has resulted in murder and stop a cunning killer before the next blow.