Chill Vampires is the standard to which all vampire related supplements to a horror game must be measured. Any game can produce a bunch of stats, some bad fiction and link them together, Chill: Vampires is a Master's Thesis on combating the undead. Not just notes for the would be vampire slayer (and game masters) but also detailed accounts of the most brazen of the undead. Complete with stats, history, motivations and the notes of previous investigators and SAVE agents.
This book is fantastic for any game but essential for a good Chill game. I would recommend it on the basis of the Dracula and Bathory write-ups alone, but there are more and even stranger and deadlier vampires in these pages.