Twenty-three-year-old Freya Flynn is a girl with a troubled past. She also has a strange hobby - at night, when the city sleeps, she likes to walk.Bad things happen at night. Bad people come out at night. And those bad people had better pray that they don't run into Freya Flynn, because Freya is on a mission to punish the wicked....Freya's past is about to catch up with her, in the form of a threatening letter from persons unknown. This person knows...