When human remains are unearthed in a flyover support, an antique chisel buried into the skull, Bliss and the Major Crime team recall an unsolved case from the previous year. The tools used as weapons in both murders suggest a Masonic connection. But are they looking for the same killer, or is there more than one person out there using a ritualistic technique to commit murder?

A Private Investigator, last known to be searching for a missing child, was found murdered in a London reservoir. The Unsolved Cases Team react swiftly when they are asked to reinvestigate, immediately suspecting a link to sex crimes. But as they make progress, they come to realise that the setup is more organised. Also, they’re not the only ones interested in the culprits.

Jimmy Bliss shifts between the two teams seamlessly, but as usual he flirts with danger and finds himself in the crosshairs of some very dangerous villains. His habit of pushing people further than they wish to bend might be about to wreak havoc with his life, leaving him with nowhere left to turn. And just when he needs his health the most, is it about to fail him…?