Multiface

From Author Wars - https://authorwars.com/publications/multiface-108511.html

Overview:

Title: Multiface
Author: Mark Adlard
Year: 1978
ISBN-10: 0441545009
Publisher: Ace Books
Price: $1.75
Pages: 240
Binding: Paperback
Type: Novel
Title Reference: Multiface
Notes:
First Ace printing: April, 1978 Exact date from laid-in Review slip [PV5 copy] Cover artist not credited in the book, but signature is clearly visible in the lower right corner and matches the rest of the Tcity Series.