Shroud for a Nightingale

The young women of Nightingale House are there to learn to nurse and comfort the suffering. But when one of the students plays patient in a demonstration of nursing skills, she is horribly, brutally killed. When another student dies equally mysteriously, it is up to Adam Dalgliesh to unmask a killer who has decided to prescribe murder as the cure for all ills.  Book 4 of series.