The secret files called the Zacharis Dossier may cause a war between the East and the West. In order to obtain a painting that is supposed to be the hiding spot for these files, Loid and Fiona enter an underground tennis tournament run by the owner of the painting, Campbell. If they win, the art piece they're after will be presented. Loid and Fiona enter as a married couple and play various skilled players including pro players!
He's said to be in possession of some 
troublesome top-secret information
قيل أنّه يحوز على معلومات خطيرة بالغة السّرّيّة
Er soll einige problematische
Geheimnisse gekannt haben,
On raconte qu’il a dissimulé
des informations confidentielles
Pare fosse in possesso 
di pericolose informazioni riservate,
Dizem que contém informações
altamente confidenciais e problemáticas,
И он тот, кто опасался,
что пламя войны может вспыхнуть вновь.