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!
run by Campbell for himself and other 
members of his underground tennis club.
يُديرها كامبل بنفسه مع أعضاء آخرين 
.من نادي كرة المضرب السّرّيّ خاصّته
das Campbell und sein
Untergrund-Tennisverein veranstalten,
Un torneo de tenis clandestino
donde él es miembro de la organización.
Un torneo de tenis clandestino
donde él es miembro de la organización.
gèrent un club de tennis illégal
qui organise
organizzato e gestito da Campbell 
e dai membri del suo circolo segreto di tennis.
realizado pelo próprio Campbell e outros
integrantes de seu clube de tênis sigiloso.
который проводит теневой теннисный клуб
Кэмпбелла и его окружения.