SYNOPSIS An invisible killer with a 100% success rate. No one is safe. Not even those closest to Washington Poe . . .  A shooting at Gretna Green. A bride is murdered on her wedding day, seconds after she slips on her new ring. It’s brutal and bloody but she isn’t the first victim and … More THE FINAL VOW By M.W.Craven @LittleBrownUK @MWCravenUK #TheFinalVow #WashingtonPoe #PoeandTilly #BookReview