From the publisher blurb: You will find in this book - a short game system, simple and new - a complete description of the hospital and its characters - "reactive investigations" to adapt following the PCs actions - game mastering advices - a 13 episodes campaign - and above all, a very deep atmosphere ! User summary: This is the only book needed to play, it has everything a GM needs to start setting up adventures in the world of patient 13. Other books for this games are not planned. Official website: http://johndoe-rpg.org/p13/