Grimm is a complete game system and setting in one volume, suitable for players and game masters alike. It includes character creation rules, a new non-d20 rules system, complete information on the Grimm Lands, imagination rules, monsters and NPCs, and much more.
From the back of the book:
Once upon a time there was a land of twisty fairy tales. Where dream and nightmares walked hand in hand, where wonder and despair were two sides of the same coin, where magic and imagination reigned, and where kindly villagers lived next door to strange beasts.
These Grimm Lands are where you - a clever kid from the Real World - find yourself trapped.
Grimm is a roleplaying game where you become an archetypal kid trying to survive in the strange Grimm Lands. You might start out as a bully, a nerd, a jock, or an outcast... but you become much, much more.
Maybe even a hero.
To survive, you'll need to overcome your worst fears, trust your fellow kids, develop your natural talents, and rely on luck and pluck, imagination and muscle.
Perhaps you'll live happily ever after... but you might also discover that not all stories end that way!