Professor T: Season 5, Episode 5

5 - 5: Cipher

As Jasper turns to tech to manage his spiralling OCD, the murder of a golf instructor and a taunting cipher ignite fears of a serial killer. A rare error from the Professor heightens tensions as the ciphers grow bolder. Meanwhile, Leonie's bond with her father, Chester, is pushed to breaking point by his deep-seated hatred of the police as Dan is caught between loyalty and duty.