Austin Grant of Scotland Yard

A transatlantic serial killer thriller with a twist of Biblical proportions.
Christmastime in London: a period of joy and togetherness. Not for Metropolitan Police Commander Austin Grant, though. Three dead bodies have turned up on his patch, and the only thing they have in common is a number carved into their foreheads.
A professor of ancient mythology, a sculptor of curious idols, frontman of The Blasphemers. It seems the killer is meting out their own justice, Biblically, punishing those who transgress the Ten Commandments. With seven commandments left, Grant sets the Met's best detectives to the case, scouring the capital before the zealot can strike again.
But soon enough, a fourth victim turns up. In New York City. It appears Grant has a transatlantic manhunt on his hands. He's going to need all the help he can get from the NYPD if he's to stop the killer – before he reaches the last commandment.

'A serial killer seems to be taking his cues from Agatha Christie and Ellery Queen ... A fast-paced tale that weds its golden-age homage to some serious violence. Sinners beware' Kirkus Reviews
'An enthralling mystery that will hook you on the very first page and keep you turning until the last. Shepherd's signature storytelling is on full display' Karin Slaughter
'A twisty, turny, globetrotting tale filled with mystery and suspense' F. Paul Wilson