Beneath the paper-thin skin of our dark reality lurk monsters whose horror defies imagining..

Join Mandy Thompson in her mission to research the mysterious monsters that plague our world in The Thompson Files, a beastiary for Arkham Horror RPG!

This supplement features Mandy's collaborations with nine other famous investigators such as Silas Marsh, Trish Scarbrough, and "Ashcan" Pete as they research over 50 eldritch horrors; both infamous and hitherto inknown.
In the collection of notes and documents you'll also find each of these investigators' own observations on these creatures' habits, dangers, and weaknesses, as well as nine mini-mysteries to help you incorporate these abominations directly into your game!