卡洛琳（海伦·巴克森代尔 Helen Baxendale 饰）是一名在北爱尔兰驻扎的英国皇家宪兵队中士，她加入军队已经有十二年之久了。一天，卡洛琳忽然被别人举报是一名同性恋者，军方因此拘捕了卡洛琳，对她进行了长达四天的审讯，在当时，同性恋甚至被视作是一种犯罪，如果卡洛琳被坐实了这一身份，她有可能因此被送上军事法庭。

在审问期间，卡洛琳的思绪渐渐飘回了十二年前，曾经的自己是一个对军旅生涯充满了激情的女孩，曾经亦接手过调查同性恋者的任务，也正是在此过程中，卡洛琳对这一群体有了逐渐的了解，她的性取向也在潜移默化之中被改变着。

1989: Caroline Meagher is a sergeant with the Royal Military Police, with 12 years' experience, stationed in Northern Ireland. Two men from internal affairs grill her for four days: someone has accused her of being a lesbian. It's an offense that leads to court martial. In a series of flashbacks, we see her enthusiasm when she joins the force, her various assignments including investigating suspected lesbians, and her own slow discovery of her sexual nature. She, like others in her situation, must go to great lengths to avoid detection. Once reported, will she withstand the interrogation? Meagher herself comments on camera at the end of the film.