Brother Assassin

From Author Wars - https://authorwars.com/publications/brother-assassin-5569.html

Overview:

Title: Brother Assassin
Author: Fred Saberhagen
Year: Unknown
ISBN-10: 0441082173
Publisher: Ace Books
Price: $2.50
Pages: 233
Binding: Paperback
Type: Novel
Title Reference: Brother Assassin
Notes: The copyright pages lists the first three Ace printings, with dates, but the number line has this as the fourth printing 4 6 8 0 9 7 5 with no date. The price puts this in late 1982, maybe early 1983. Cover art by Michael Whelan is also on the copyright page but there's no sign of his squiggly little 'signature' on the art.