Anthony Trollope 
Man Who Kept His Money in a Box [EPUB ebook] 

Mr. Robinson comes upon a party of travellers, the Greenes, consisting of one older man, a young woman, and a much younger woman, the lovely Sophonsiba. Early on in the story, Robinson is apprised of the fact that one of the seven boxes with which they are journeying to Italy is full of jewels and English sovereigns. Robinson is not particularly pleased to be the recipient of this information, and it would seem that the next thing to happen was this disappearance of this box. And so it happens. (Goodreads)