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!
I forgot to mention this, 
but in this tournament,
،نسيت أن ذكر هذا، لكن في هذه المنافسة
Ganz vergessen, aber in diesem Turnier
Olvidé decir que el torneo permite
raquetas y pelotas modificadas,
Olvidé decir que el torneo permite
raquetas y pelotas modificadas,
J’ai oublié de mentionner
une chose.
Ho scordato di dirle che in questo torneo
Esqueci de dizer, mas neste torneio,
Совсем забыла предупредить…