Suspecting that Lucy is cooperating with the terrorist organization known as the Armed Detective Agency, Jouno and Tetchou pay a visit to the cafe at where she works, in hopes of tracking down Atsushi and Kyouka.
which means they're going to 
investigate the casino thoroughly.
،ما يعني أنّهما سيتحقّقان من الكازينو بشكل كامل
Also werden sie das Casino
gründlich untersuchen …
Investigarán el casino a fondo.
Investigarán el casino a fondo.
Ils vont passer le casino
au peigne fin,
Il che significa che perlustreranno a fondo il casinò.
Resumindo, vão investigar
o cassino minuciosamente.
Теперь у них есть повод
прошерстить казино.