It returns six months after the shocking finale of Season 3, and the team must overcome their grief to tackle a dangerous crime wave.    (📙)                  (🈴)  (⛏)    (🧤)                (🧟)        (🗳)    (💝)            　　This time, the gloves are well and truly off for Professor T in his lectures and a new musical pursuit, romance is very much alive for his mother Adelaide Tempest (De la Tour), and the lines between professional and personal become blurred for therapist Helena Goldberg (Stevenson).                                          (🌛)        (🏰)                (♉)  (😞)　　Meanwhile, DI Maiya Goswami (Sunetra Sarker) takes charge of the police force with series favorite DS Dan Winters (White) fiercely at her side.