A murder in Victorian London. A deadly secret society. And an investigator who travels through time in search of the truth. Detective Ali Dawson works under the strictest secrecy. With her team, she travels into the past to investigate unsolved murder cases. Her latest assignment is particularly explosive: she is to solve the murder of a young woman in the 19th century. But the time travel goes wrong, and while Ali is stuck in the past, her life in the present gets out of control. Detective Ali Dawson leads anything but a normal life. She has just turned fifty, is a single mother of a grown-up son and part of a secret investigative unit that travels back in time to solve old murders. Usually, they were only a few years ago, but in her latest case everything is different: On behalf of the Minister of Justice and Tory MP Isaac Templeton, she travels to the Victorian era. There she is supposed to clear the name of Templeton's eccentric great-great-grandfather. According to rumors, he was a member of a shady circle of men.