From the Introduction:
The Spearhead LRP / Haven Rule Book set comprises:
Part I - The Land of Eden, is intended to describe the campaign world and the known history of Eden.
Part II - Haven, gives more detail of the actual area where the campaign is set.
Part III - The Game System, is intended to describe the mechanics that are used to represent the Land of Eden in terms of roleplay. Rules for character generation and progression are included.