To me, a Stormbringer RPG 1st/2nd edition fanatic this is as good as it gets, because this little gem of a companion for a game I totally adore contains my no. 1 favorite Stormbringer scenario called "Sorcerer's Isle". And in spite of the text above it is NOT "a shorter, more intense scenario" for it is a mini-campaign on an island full of dark old secrets and newer secrets. It already underlines the games' dark themes and lets you explore them as a planned (or not) excursion of the Island. I cannot recommend this enough. All the parts of Sorcerer's Isle lets you, the GM, build the happenings in your own style and in your own pacing.
The companion as a whole is also full to the brim of other nice stuff, another interesting scenario, rules on Sanity and Runes, as well as more creatures. It expands on the already lovely unbalanced game, as it should be with it being set in such a Chaotic World. Enjoy!