A recluse with an unusual hobby, a telekinetic pantomime dwarf, an embittered hook-handed clown, a serial killer-obsessed man-child, and a deranged but caring midwife all receive the ominous message `I know what you did'.

Mr Lomax enlists the help of his care worker in the quest to complete his unusual collection, and things go from bad to worse when a misunderstanding leads David and his mum to cover up for his incompetence at the murder-mystery evening. Meanwhile, Robert is surprised when Debbie asks him out on a dinner date, and midwife Joy enlightens the morning group about the perils of choosing a water birth.

Revealing the story of how Mr Jelly, the one handed children's entertainer, ended up the way he is, and Mr Lomax travels to the private auction of Snappy the Crocodile in Dudley. Elsewhere, David and his mum dispatch their next victim disguised as beauticians, and Robert wreaks his revenge on Debbie during a midweek matinee of `Snow White'.

David and his mum are mid-murder when an unexpected visitor throws them into panic. Who is the mystery caller? What will happen to the body in the trunk? Plus, will Maureen finally get to try one of those pyramid teabags?

Midwife Joy is left alone with her demonstration doll Freddy, when a miracle happens. David and his mum lure their next victim to a waxwork museum and Mr Jolly explains to Mr Jelly the reason for the blackmail letters.

A battle of wills ensues between Robert and Debbie with more than cross words flying through the air. Meanwhile, Mr Jelly is plunged into danger, Maureen discovers the truth and Mr Lomax gets a new home help.