Gustave has taken it upon himself to observe Marion and Sanglain following the death of the Princess and DT.   But KT thinks Gustave is in the city of Marquesas for other reasons. 
I know that Marquesas is 
famous for its pretty women.
sé que Marquesas es famosa 
por sus bellas mujeres.
sé que Marquesas es famosa 
por sus bellas mujeres.
eu sei que Marquesas é famosa
pelas suas mulheres bonitas.