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!
Did they wander in here thinking 
it was a tourist attraction?
هل أتيا إلى هنا معتقدان أنّه مكان جذب سياحيّ؟
Die halten das wohl
für ’ne Spaßveranstaltung.
¿No serán dos turistas
que se despistaron?
¿No serán dos turistas
que se han despistado?
Vous vous êtes égarés
pendant vos vacances ?
Forse sono dei turisti capitati qui per errore.
Pararam aqui achando que
fosse uma atração turística?
Может, это туристы заблудившиеся?