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.“没有什么要说的，记住两个月内，我要见到的两根鬼烛在我面前，另外你还欠我一个驾驭厉鬼的机会，虽然我现在用不上以后会用到的......仔细想想，你欠我的东西太多了，改天我需要的时候会向你要债，这是一份资料，你自己看着办。”杨间将一个准备好的文件丢过去。