Killer's Curse - The DI Shona McKenzie Mysteries, #7

Faced with the horrific murder of two Father Christmases DI Shona is hurtled into the centre of another deadly spree by a killer who will stop at nothing. With no clues and a rising body count she is shocked to find herself not only investigating in Dundee but also, New Orleans and the Louisiana Bayou. As the body count rises higher than the sticky Louisiana heat, Shona joins with her American colleagues to stop a serial killer in their tracks before Christmas is ruined forever.
What, and who, could possibly link these cities other than one grisly murder after another.