Professor T

Weeks after yielding to desire, Jasper and Helena test their new romance at a luxury hotel and spa. But two "natural" deaths rouse Jasper's suspicion, drawing him into an obsession that threatens their fragile bond. Meanwhile, Dan is pulled toward enigmatic Leonie, sensing a spark that might finally break the grip of his past.

After a charity boxing upset, champ Rhys Gibson is found bludgeoned to death, sparking a deadly fallout. Back from her world trip, Adelaide collapses mid-flight leaving Jasper torn between the case and his mother's failing health, leaning on Helena for help. But guilt and grief weigh heavy. Dan's first date with Leonie takes an unexpected turn when her crime-boss father turns up.

A mysterious death at a spiritual retreat pulls Jasper into the orbit of the enigmatic Lady Cynthia, and the post-mortem shatters the guests' identical stories of an open and shut case. As tensions spike and a near-confession is abruptly cut short, Jasper's unresolved grief for Adelaide shadows his every move, heightening the pressure on both the case and his fragile bond with Helena.

When Jasper's former mentor, Hamish Maclean, is murdered, a shaky arrest and twisting testimonies expose a deeper conspiracy. Drawn into a maze of old loyalties and buried deceit, Jasper uncovers a cunning plot that forces him to risk everything--including his own life--to unmask the killer. Meanwhile, Dan's bond with Leonie falters under her father's quiet sabotage.

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.

Dan's choice to expose CCTV evidence against Leonie's father jeopardizes their relationship and sparks dangerous reprisals. As tensions explode, a seemingly random Comic Con stabbing reveals a dark plot as Chloe races to unmask the killer. With Jasper and Helena ready to leave for America, Dan's shocking arrest for murder pulls the team into a finale where loyalty and love are pushed to the edge.