Season three of CITY ON A HILL brings us to Boston's high society Beacon Hill. Having left the FBI and thrown his badge into Boston Harbor, Jackie Rohr (Bacon) lands a lavish new gig running security for a wealthy family. Life is good until secrets begin to unravel. When an investigation opens, ADA Decourcy Ward (Hodge) sees an opportunity to finally rip out the machinery perpetuating a broken criminal justice system. Siobhan Quays (Banks), representing a construction worker who was severely injured on the Big Dig, encounters the city's corruption firsthand, all while coping with the traumatic events of her past year. As Jenny Rohr (Hennessy) can attest, given her history with her father, some experiences will haunt you beyond your breaking point.

　　亚里克斯（丹尼尔·多埃尼 Daniel Doheny 饰）对自己的高中生活感到十分的满意，他是全校公认的优等生，深受老师的喜爱和同学们的崇拜，在好友之间有着极高的人气。不仅如此，亚里克斯还交往了一位名叫克莱尔的（马德琳·温斯坦 Madeline Weinstein 饰）女友，克莱尔在校园里也是校花级别的大美女，每当她和亚里克斯出双入对之时，旁人都会惊叹他们简直是天作之合。
　　就在亚里克斯和克莱尔决定开启通往快乐的伊甸园的大门之时，一个名为埃利奥特（安东尼奥·马尔齐亚莱 Antonio Marziale 饰）的男人出现在了亚里克斯的生命力。埃利奥特对自己对于亚里克斯的喜欢直言不讳，虽然亚里克斯对此感到非常的困惑，却没有讨厌的情绪。