Thayer David as Nero Wolfe

Tom Mason as Archie Goodwin

Anne Baxter as Mrs. Rachael Bruner

Brooke Adams as Sarah Dacos

Biff McGuire as Insp. Cramer

Sarah Cunningham as Mrs. Althaus

John Randolph as Lon Cohen

John O'Leary as Theodore Horstmann

David Hurst as Fritz Benner

Lewis Charles as Saul Panzer

Frank Campanella as Fred Durkin

John Gerstad as Dr. Vollmer

John Hoyt as Hewitt

Ivor Francis as Evers

Allen Case as FBI Chief Rugby

Katharine Charles as Marian Hinckley

Robert Phalen as Yarmack

Sam Weisman as Quayle

David Lewis as Mr. Althaus

Rod Browning as 2nd FBI Man

Joe George as O'Dell

Richard Ford Grayling as 1st FBI Man

Charles Horvath as Purse Stealer / Wolfe Operative (uncredited)