Here is a description of the game from Die Pöppelkiste:

The game Kreuzverhor (Cross Examination) is a deduction game – one of a relative few in the genre. The game’s object is to find the right combination of criminal, crime scene, crime and tool. To do this, players alternately play out combinations and find out how many of them are correct (but without finding out which ones are correct). They can then play an action card that lets them get additional information. These action cards can be neutralized using defense cards. The first player to deduce the right combination and lay it out wins. The game sounds a little like Mastermind, but with the extra cards that can provide more information.