After a high-powered lawyer gets three petty thugs off on a murder charge, Regan is authorized to use whatever means necessary to bring the hoodlums in.
Regan is convinced that Eddie Boyse, a recently released career criminal, is responsible for a robbery, but Boyse was with Regan when the crime occurred.
When the Superintendent finds out that there is a bank robbery in progress on a Saturday afternoon, he assigns Regan to visit an old girlfriend whose apartment is adjacent.