P. D. James Box Set (The Black Tower, Shroud for a Nightingale, Unnatural Causes, An Unsuitable Job for a Woman)

This is a boxed set of early 70s P. D. James Mysteries by Popular Library. The number of pages refers to Book I of the Series, The Black Tower. There are 4 books in the slipcase: The Black Tower, Shroud for a Nightingale, Unnatural Causes and An Unsuitable Job for a Woman.