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.美国总统在得知前方战局后狂骂哈尼之余让部队停止了攻击，至于被困的那一千多士兵只好先困着，死了那也是没法子的事情，如果不死就熬着吧，很明显丧尸困住他们唯一的目的就是让人类去救援，以此为诱饵来消耗人类的力……