A former barrister Alex Lambert (played by Ian Hendry) who had been disgraced and debarred has to rebuild his life.
[1] He uses his former contacts on both sides of the law to become a paid informer for the Police.
[1] Living well from the rewards paid by insurance companies, Lambert still has to hide his activities from both his wife and others behind a new persona in the guise as a business consultant.
[1] Other regulars in the series included Jean Marsh, Neil Hallett and Heather Sears.
Guest actors included Peter Bowles, Peter Vaughan, Trevor Bannister, George Cole, Nerys Hughes, David Kelly, Murray Melvin, Eric Pohlmann, John Carson, Nicholas Courtney, Dudley Foster, Tracy Reed, Pauline Delaney and Roberta Tovey.