Running wild1988
by J. G. Ballard
The thirty-two adult members of an exclusive residential community in West London are brutally murdered, and their children are abducted, leaving no trace. Through the forensic diary of Dr. Richard Greville, Deputy Psychiatric Adviser to the London Metropolitan Police, the brutal details of the massacre that has baffled the entire police department unfold.
— from OpenLibrary
13 editions at OpenLibrary