[3] Inquisitor plays similarly to the Baldur's Gate series, being a top-down role-playing game.

The player also investigates crimes against God and the king by finding evidence against the suspect, after which they may be arrested, tortured, and, after conviction, burned at the stake.

Evidence in Inquisitor includes the testimony of other characters in the game, as well as items found at the location where the crime was committed.

[5] The setting of Inquisitor is the fictional kingdom of Utherst, in which the omens of the Prophecy of Saint Ezekiel have started to appear, foretelling the end of the world.

The main character, Maxmilian Conti,[6] is an Inquisitor who is sent to the town of Hillbrandt to investigate the murder of a local merchant.

[7] Maxmilian finds out that the merchant was murdered by Linda von Callagan, a wife of a local noble.

At first she denies her guilt but later she confesses out of fear of being murdered by bishop Vallarian, the highest-ranking Inquisitor in the area.

It is revealed that Vallarian plotted the problems in Hillbrandt to retrieve an artifact found by the murdered merchant.

His investigation leads to a fight against all summoned demons and finding the actual leader of the cult – archbishop Laurentius.

If the player decides to stop the cult, Maxmilian kills Laurentius but has to fight the fallen angel Azrael.