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.