When John Madson is released from prison, after serving eight years for a murder he did not commit, he is determined to discover the truth behind his arrest and false imprisonment.

Sir Ranald Heamley hires Madson to investigate a case of blackmail.

Madson helps a woman who is being threatened by her estranged husband.

Madson is asked to help Gordon's sister-in-law, who is being evicted from her bedsit.

Madson returns to prison to help a teenage boy who has been wrongfully convicted of theft.