When an escaped Muslim militant surfaces in Hamburg to claim an inheritance, a German intelligence agent uses him to trap a well-regarded Muslim scholar suspected of financing terrorists.

A German Intel agent employs an escaped Muslim militant to expose a renowned Muslim scholar suspected of having terrorist links

Just a thought...

A crusty German intelligence agent scrambles to determine if a half-Checan, half-Russian Muslim is a victim seeking refuge or a terrorist seeking revenge.

I fashioned mine on the basis of the synopsis on the DVD jacket for the film. But the one you found is a better one to work with. So:

When an escaped Muslim militant surfaces in Hamburg to claim an inheritance, a German intelligence agent uses him to trap a well-regarded Muslim scholar suspected of financing terrorists. (27 words)