The underground tennis tournament is finally heading to the final match. The Campbell siblings that Loid and Fiona are up against are playing dirty, as they have altered tennis rackets as well as the staff helping them out. But the spy pair from WISE overcome one obstacle after another and Loid deals the final blow! But right after the match, the State Security Service finds out about the dossier and infiltrates the tournament...
I don't understand why they 
just suddenly burst into song.
.لا أفهم لماذا يبدؤون بالغناء فجأة
Warum fangen die auf einmal an zu singen?
¿Por qué cantan de repente? Qué absurdo.
¿Por qué cantan de repente? Qué absurdo.
Pourquoi chantent-elles d’un coup ?
Non capisco perché 
all'improvviso si mettono a cantare.
Não entendo por que
começam a cantar do nada...
Зачем они вдруг петь-то начинают?