Passionate defence barrister Martha Costello faces challenging cases and surprising clients, which test her faith in the criminal justice system. Gifted colleague Clive Reader is called to the bar with her. They work hard with pupils, Nick Slade and Niamh Cranitch, but ultimately only one can eventually be taken on as a member of chambers.

Mildred Hubble is a young witch attending Cackles Academy. She's called the "Worst Witch" because she's always caught getting into trouble.

The Meldrews go on holiday to Portugal with Mrs Warboys, who is hoping for romance with her penpal Alfonso. Photographer Martin Trout follows them there, believing they have a roll of film that belongs to him.