

A Little Drop of Poison
After Season 3’s shocking finale, Dan and Jasper are consumed by grief. Dan throws himself into work while the Professor hides in his lectures, avoiding the police at all costs. But Helena, Jasper’s therapist, helps him face back up to his police work and the team tackles complex and dangerous cases. But through the danger and mystery, love is very much in the air.
A Little Drop of Poison
Season 3 Episode 4 | 50m 46s | CC
Out of prison the Professor is desperate to get back to his work at the university and with the police. Detectives are struggling to find a pattern to link a series of unexplained deaths across Cambridgeshire and need the Professor’s help with the investigation before more people die.