Bloodline takes place during World War I. John Shaw, a nineteen-year-old, joins the British Army and is sent to the front lines, in the trenches. He works as a communications officer who listens to German radio feeds and translates what he hears. His regiment commander is a man named Quincey Harker, who is the son of Jonathan Harker and Mina Murray from the original Dracula novel. The book ends with John remaining at Castle Dracula, Quincey going off to live somewhere else, and Mary and the baby, who she names Grace, escaping back to England.