Thirteen years ago, DI Helen Birch's little brother Charlie disappeared.
Two days ago, Birch was part of a raid on one of Scotland's most feared criminal organisations.
Yesterday, Charlie came back....
Now Birch has a choice: save her career, or save Charlie?
As she interrogates her brother, we see his story, in a brilliantly tense and clever story about what people will do to survive and the lines they'll cross to protect those they love.