The Black Tower is the fifth in PD James's series of detective novels featuring Commander Adam Dalgliesh. It is set in Dorset, where Dalgliesh goes to visit an old friend in a care home, only to find himself investigating a series of alleged suicides there.
It was turned into a 6-part mini-series by Anglia Television in 1985, with Roy Marsden playing Dalgliesh. The mini-series was mostly filmed at Clavell Tower on the Isle of Purbeck. It is being filmed again by Channel 5 as part of its forthcoming series Dalgliesh, starring Bertie Carvel in the title role.