A fantasy club in Beantown's Leather District is the site of a gruesome murder scene, and detective Mike Mackenzie, who is respected by few, takes over the police investigation. Mackenzie has a dark and hidden side-a side with ties to the intricate world of sadomasochism. Plagued by a recurring nightmare, Marston visits department psychologist Dr. Grafton, who suggests that his frequent dreams may be helping him handle the traumatic situations he encounters from day to day. From Boston Police headquarters to the parlor of prostitute Star Vechino, Dr. Grafton and detective Mackenzie must tap into Marston's innermost thoughts, and they may ultimately discover the reason behind his hidden fears. Meanwhile Marston teeters on a thin line between fantasy and reality, and between sanity and insanity, and those that suspect him must decide whether to expose the seedy events that are besetting the department.

In Marston's File, author Fredrick Antonovich weaves a tale of horror, murder, and fantasy that exposes what can really happen in the dark corners of a bustling police department.