Professor T finds himself in unfamiliar surroundings banged up in prison after the explosive finale to season 2. In this season both their careers are on the line, and both have momentous decisions to make.  Will Christina allow Jasper to incriminate himself to save her career or will her conscience and the formidable duo of his mother Adelaide and his therapist Dr Helena get the better of her.

The Professor struggles in prison – the hostile, dirty and noisy environment plays havoc with his OCD plus he is a curiosity among the inmates. But his brilliant criminal mind will soon be put to good use by some of the less than brilliant criminals he finds himself surrounded by.

Again, the police will need the Professor’s analysis and insight to help them solve a series of intriguing crimes. Within the police there’s also been a shift in power as Lisa Donckers enjoys a promotion. There is also a new boss in the police station, DCI Maiya Goswami who takes over from DCI Christina Brand, her style of management is abrasive and direct and very different to her predecessor’s.

Joining our cast of regulars headed by Ben Miller as Professor T, we welcome back Frances de la Tour as Adelaide and Juliet Stevenson as Dr.Helena. The new DCI is played by Sunetra Sarker who joins our main cast. Guest appearances from some familiar faces including Jeany Spark, Flora Montgomery, Jack Ashton and Roger Barclay.