Twins Ana and Nan are lost after the death of their mother, a renowned author who seemingly killed herself by jumping out of a window. Everyone knows who drove Elena to suicide – her long-time literary critic, Eben. But the twins need proof if they’re going to get their revenge. When Eben requests access to Elena’s diaries at the National Library where the twins work, desperate to clear his name, they see an opportunity. With careful planning and just a little outside help, the twins lock down the labyrinthine building, trapping their colleagues, the public and most importantly Eben inside. But as a rogue security guard starts upsetting the plan and freeing hostages, Ana, Nan and Eben find themselves pushed to the limit. And what began as a single-minded act of revenge blooms into a complex unravelling of loyalties, motives and what it is that makes us who we are.