On the sunless moon Io, Marshall William T. O’Niel goes toe-to-toe with the corrupt manager of a mining colony and his gang of roughnecks while investigating a rash of worker suicides.

Marshal William T. O'Niel

Mark Sheppard

Dr. Lazarus

Sgt. Montone

Carol O'Niel

Sgt. Ballard

Sagan

Tarlow

Paul O'Niel

Lowell

Flo Spector

Hughes

Walters

Cane

Officer Slater
May 22, 1981

Marshal William T. O'Niel

Mark Sheppard

Dr. Lazarus

Sgt. Montone

Carol O'Niel

Sgt. Ballard

Sagan

Tarlow

Paul O'Niel

Lowell

Flo Spector

Hughes

Walters

Cane

Officer Slater
