Adventures/ Fiction (?) The book is about 2 twin brothers, one very frail and the other very healthy, the weak one commits murder and the other is asked by the family to take the blame and go to prison, from where he would escape by sea. Read in 1990s.

[Jolie]

He agrees but then finds out his fiancé married his twin and so decides to spend some years in prison, marries and gets deported to Australia or NZ. His daughter, a pearl collector, decides to rehabilitate his name. Read in the 90s, probably published in the 70-80s
Book wasn’t read in the original language, but a translation (Romanian).