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.
第三季令人震惊的结局过去了六个月，本季回归，团队必须克服悲痛，才能应对一波危险的犯罪浪潮。
这一次，T教授在讲课和音乐追求上都彻底放飞自我；他的母亲阿德莱德·坦佩斯特（德拉图尔饰）的爱情生活也十分甜蜜；而对于心理治疗师海伦娜·戈德堡（史蒂文森饰）来说，职业与私人生活的界限变得模糊不清。
与此同时，警探玛雅·戈斯瓦米（苏内特拉·萨克尔饰）接管了警队，而深受观众喜爱的丹·温特斯警探（怀特饰）则坚定地站在她身边。
