When the body of a young woman is discovered in an East London park, DI Erica Swift and her Violent Crimes taskforce are called in to investigate.
The victim appears to be uninjured, but symbols drawn on her body tell of a more sinister story.
The case is confusing, with question upon question mounting.
Why are there no signs of violence on the body? How did she die? And what do the symbols mean?
When Erica discovers that many more lives are in danger, she finds herself in a race against the clock to track down the person responsible.
Could she be about to take on her most challenging case yet?