Mannix, on the mend after a gunshot wound has one foot in a cast, is given a routine assignment by Intertect boss Lew Wickersham: get the signature of a man named Amos Silo on a legal document. The detective takes a bus to a small town but finds a chilly reception whenever he inquires about the man or his ranch. The town is hiding something. As Mannix digs deeper, he discovers dead cattle are part of the mystery. The question is whether he'll survive to find out the rest.—Bill Koenig
Nursing an injured foot, Mannix travels to Grandvale, an isolated town, to obtain a signature. Nobody wants to help him, and some want to kill him as he uncovers the secret the whole town wants protected.