Lipstick on your collar... Murder on your mind... following the bombshell ending of Kill Your Darlings, Declan Walsh has a new job, a new office and a new remit - but when a City of London art gallery discovers the star of their latest exhibition dead, with only a signed, painted "kiss" on his neck to go on, Declan and his team must investigate a murder that involves brutal vengeance, a family linked to a painting stolen by the Nazis in WW2, and a long-forgotten promise.

But, as the bodycount rises and the motive changes, Declan starts to wonder if the clues are leading towards the killer - or away, while Alex Monroe finds himself the target of a gangland hitman, desperate to stop him testifying at an upcoming trial...