This is a supplement for the revitalised Monsters!Monsters! game. It comprises a short solitaire adventure, suggestions for running the solo as a GM adventure (and expanding it), and additional background on the Kindreds of Zimrala (The "offical" M!M! game setting). The book also includes a set of one-page "easy play" rules.
When solitaire gamebooks first came out they tended to be rather chaotic, effectively a series of random encounters. This book is much more coherent. As you work through the paragraphs of the adventure, there's a definite sense of a story being told - your decisions as a player will influence what happens, but everything will unfold in a logical fashion. Also, the descriptive passages within the text establish a strong and coherent backdrop to the adventure (and also suggest hooks for a GM to expand upon).
The separate GM section includes a map and briefly describes some additional locations. There is a lot of potential for a GM to build their own adventure around this, either following on from the solo or as a stand-alone story.
The book includes two sample characters, always useful for gauging the difficulty of an adventure. One is very powerful but still not guaranteed to survive (I speak from experience...)
The easy play rules are intriguing - enough to get you started, though necessarily they don't deliver the richness of the full M!M! experience. (The full M!M! rules are available separately and are a bargain, in my opinion.) Even if you are an experienced player I'd recommend trying easy play at least once - it's an interesting exercise in mental discipline.
Overall this is a nice package at a decent price. M!M! products are appearing quite frequently at present - I'll be looking out for more