1665. Silas - a Searcher of the Dead - is killing Plague victims for fun; the ready supply of victims means that he can satiate his desires easily. In 2015, at the Crossrail dig in London, two bodies are found, just as a spate of murders takes place. As the police rush to put together the links between the two, the modern-day serial-killer fights to stay ahead of them enough to kill again. DI Mark Fairgreaves and his team must work together to put together the pieces before they lose one of their own.