Episodes
The Professionals: Involvement (William Russell, Patricia Hodge)
Involvement: In the midst of a shoot-out during a drugs smuggling investigation, Doyle meets and falls for Ann Holly, only to discover that CI5 suspect her of being closely linked to the scam herself.
Written by Brian Clemens; directed by Chris Burt
With William Russell, Patricia Hodge, Ray Ashcroft, Valentine Pringle, Christopher Guard, Peter Godfrey, Peter Holt, Peter Burton, Kirstie Pooley, Philip Anthony.
Original Airdate: 29 September 1980 on ITV
Season 4 Episode 4