This was a valiant but flawed attempt to translate the rules-light, broken-but-playable mechanics of the original In Nomine system to the crunchy-gears GURPS system. Given that it's very easy for two starting PCs in In Nomine to vary by as much as a thousand points when you write them up as GURPS characters, it worked about as well as could be expected. I would really not recommend trying to run a GURPS In Nomine campaign; if you like the setting, use the original system. However, this book is worthwhile if you want to add In Nomine-flavored angels and demons to an existing GURPS campaign.