U.F.O.

Petty private detective Finn Zehender eagerly dumps a measly infidelity case when offered a lucrative 'state job' by low student Agnes Sonntag, who poses as state attorney: minding the pubertal brats of Swiss banker Urs Jäger, who is about to hand the German government a list of rich and powerful tax offenders. The kids were the best way to extort it from him, notably the Spanish Vargas crime brothers, who want to blackmail the mentioned persons, including German MPs, hence the state security' Verfassungsschutz' is involved. Finn Zehender witnesses a semi-failed bomb attenuate on Urs and takes his teen charges Moritz and Mathilda Jäger to his half-crazy giant friend Gerd Mühlfellner's home boat. Finn soon has to deal with a web of ruthless henchmen and suspicious or fake servants of the law. The kids are believed the clue to the list via 'the image of Saint Martin', so the race is on to find and seize it and everything goes.