Detective Nick Posh finds himself engulfed in another intricate and intriguing murder case; one he has been invited by Scotland Yard to help solve. A slew of international murders spanning both sides of the "Big Pond" has led the American to join forces once more with his counterparts in the United Kingdom to stop the "Rub-a-Dub" murderers. A Roaring Twenties thriller taking shape and spreading out over the thistled heathered moors of Scotland; rearing its ugly menacing head in the heart of Edinburgh. With his father's murder case being all but swept under a media blackout, the only thing Posh can do is put his energies and efforts into solving something with clues to follow; promising himself his father's case will never grow cold.