Adam Knight is a young man who, having tried several jobs, decides to set up an agency, 'Knight Errant '59', to solve other people's problems - whatever they may be. There's plenty of scope and, assisted by former reporter Liz and idealistic young writer Peter, the latter-day Sir Lancelot is kept busy with a variety of curious and exciting cases. The series had two titles, Knight Errant '59 and Knight Errant Limited of which only two episodes exist out of the 75 produced.

13th October 1959 - 22nd June 1961