The game relates the events told in the Bible in a somewhat parodical fashion, and explains the existence of other religions and magic with a sense of humor.

The backdrop for the game is the modern world, but one where angels and demons incarnate themselves in human bodies in order to fight for good or evil.

A typical adventure includes a lot of inquiry, detective work and roleplay, sprinkled with a few conflicts followed by a big, final showdown.

Apart from English, the 2nd Edition of the game has also been translated as In Nomine: Magna Veritas in German [Truant Verlag (1993)], Spanish [Joc Internacional, (1994)] & Polish.

Croc also created a space opera sequel to this game, Stella Inquisitorus (1993), that takes place in the year 6993.