M Squad
Lt. Frank Ballinger is a no-nonsense plain clothes cop in the elite M Squad Division. The Squad's task is to root out organised crime and corruption in America's Second City, Chicago.

A swimsuit model is found dead in Lake Michigan, but physical evidence indicates the she may not have drowned while swimming. Lieutenant Ballinger becomes convinced that she was murdered after he learns that she was a strong swimmer and an iniquitous individual with a large number of unexplained bank deposits.