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.楚翔口干舌燥的给大家解释，可是没人理他，就连林波波、方雨璇等人也是自己上了车，肥肥还站在车门口对楚翔做了个兰花指状，“唉呀楚队长你不觉得累吗，我们可是要走了，你要是愿意留下来我们就不奉陪了。”……