The Black Tower. Poster of the 1985 TV series and cover of the 1975 book
VS3
The Black Tower
P.D. James, 1975
TV series vs book
Ronald Wilson, 1985

Commander Dalgliesh is recuperating from a life-threatening illness when he receives a call for advice from an elderly friend who works as a chaplain in a home for the disabled on the Dorset coast. Dalgliesh arrives to discover that Father Baddeley has recently and mysteriously died, as has one of the patients at Toynton Grange. Evidently the home is not quite the caring community it purports to be.