“McFadyen has worked every angle … The tension builds with each page…. Above all, McFadyen is a supremely gifted storyteller. The Darker Side is an utterly compelling thriller.—Booklist, starred review
“Agent Smoky Barrett pulls out all the professional and emotional stops to nail a secretive serial killer.”—Kirkus Reviews
“McFadyen knows how to shock.”—Publishers Weekly
From the Hardcover edition.