It is London in the early 1960s and Teddy Bean is making a name for himself as a private detective.

However, his personal problems are taking over, with his brother, John, only slowly recovering from a heart attack and his wife, Pearl, dying in a car accident. Added to this, he takes on a difficult case involving a woman presumably drowned at sea by her husband.

Teddy needs help while his brother is incapacitated and finds it in his friend, ex-Detective Inspector Tony Halliday. With the added support of their secretary Muriel, the Bean Detective Agency is open for business once more!