Title: The Case Of The Grinning Gorilla
Author: Erle Stanley Gardner
Imprint & Number: Pocket 1121
Cover price: .25
Publication date: 6/1956
Cover artist: Milton Herder (photo)
From the back cover:
An Intimate Diary And The Juiciest Pin-Ups Perry Mason Had Ever Seen:
These clues led Perry to a weird mansion. Here an eccentric millionaire kept two women and a zoo full of gorillas.
The man-like animals brought Mason to his most ingenious solution of a murder. But the answer led Perry close- much to close – to a horrible death. He was trapped by two killers: one human, the other – a crazed and grinning gorilla.