Jenny Aaron was a government assassin, part of an elite unit tracking Germany's most dangerous criminals. She was one of the best, until a disastrous mission ended with her abandoning a wounded colleague and losing her sight forever. Now, five years later, she has learnt to navigate a darkened world, but is haunted by her betrayal. When she is called back to the force to trace a ruthless serial killer, she seizes the opportunity to solve the case and restore her honour.