How to Investigate the Art Dealer?

The daughter says she went to her cabin, but she was in her friend elaine's room. Elaine: I think i did hear a splash just before 11, but i was quite sleepy. So what do we do? Er, accuse miriam of committing the crime anyway? Or we investigate prea chander, a first ass passenger at the victim's table. She is an art dealer with an interest in asian art. This is very vague, isn't it? It's kind of like we'll look at this person, but if he's not carrying a book, then that's a fire. We'll just pick someone who's in first class yet, a barman