Sammy and Sara are identical twins. They meet in their private heaven, a place they call Nysa. Sara lives in the Great Plains during the late 1800s. She is an outcast in a world that despises her existence. She delivers personal justice with a six-shooter and a knife. Sammy lives in the 21st century. She is deemed crazy, possibly schizophrenic, and is locked away in a mental institution. She is kinder than her gun-toting twin, but she is also responsible for three dead bodies. She is considered a threat to society and herself. The truth is both Sammy and Sara are killers, and both are also immortal.