该剧剧情背景设定在约克郡，主要聚焦在Zak和Tom两个主要角色身上，他们是一个角色是普通律师，另一个角色是天使——降临地球专做善事。 萨缪尔·韦斯特（Samuel West）扮演从天堂来地球执行「公务」的天使Zak Gist，Ukweli Roach扮演他的搭档、新天使Tom Greening。他们以律师的身份帮助人们认识自己的缺点、战胜自我，但Tom总是惹麻烦。哈蒂·莫拉汉 （Hattie Morahan）扮演Zak的爱情对象，而托比亚斯·莫雷蒂（Tobias Menzie）扮演反派角色、黑暗天使Richard Pembroke。来自《危机边缘》的欧拉·布拉迪（Orla Brady）将扮演Zak和Tom的上司Sheringham夫人。
永恒之法 (季节 1)
Episode 1 (集 1)
播出日期: 2012-01-05
运行时间: 60 min
概述: A pair of angels move to York and set up a legal practice to help humans in trouble. Their first case sees them try and prove the innocence of a man accused of shooting his ex-girlfriend on her wedding day.
Episode 2 (集 2)
播出日期: 2012-01-12
运行时间: 60 min
概述: A six-year-old asks Zak and Tom to intervene in a custody battle between his adoptive parents, but they find themselves facing Hannah and Richard when the case goes to court. Meanwhile, a mysterious package from Mr Mountjoy arrives at the Belfry, containing a grim relic of the Cuban Missile Crisis.
Episode 3 (集 3)
播出日期: 2012-01-19
运行时间: 60 min
概述: Zak and Tom defend an 82-year-old man accused of poisoning the owner of his care home and end up taking him to stay at the Belfry while the trial is on. Zak continues to be tormented by his feelings for Hannah, while Tom has a night on the town - much to Mrs Sheringham's disapproval.
Episode 4 (集 4)
播出日期: 2012-01-26
运行时间: 60 min
概述: A whole community unites behind a single mother on trial for the stabbing of her alleged stalker - but Tom feels that there is more to this lonely and bereaved woman's story.
Episode 5 (集 5)
播出日期: 2012-02-02
运行时间: 60 min
概述: Mrs Sheringham is tortured by memories of Billy. Zak and Hannah defend a young female soldier in a court martial, and Zak watches while Hannah gets closer to Major John Parker.
Episode 6 (集 6)
播出日期: 2012-02-09
运行时间: 60 min
概述: Mrs Sheringham is tempted by an offer to leave York, and Hannah has a decision to make. Meanwhile, Zak and Tom defend a man accused of murdering his brother. The man protests his innocence and as the angels strive to uncover what once bound the Hale brothers, they go head-on into battle with Richard, who has significantly raised his game.
季
集 6