This began as a fun and interesting book which I thought I'd really enjoy. Seeing the main character, London, make a life decision based on what was best for her, personally, was empowering. The book was not badly written; no egregious errors in spelling, sentence structure, punctuation, etc., either--always a plus. I generally love travel tour mysteries because they introduce me to places I've never been, and lead me to jump right out of the story to the Net so I can look up the tourist attractions described; in that, this book was exceptional. I learned a lot about Hungary and Budapest.
But the mystery itself was forced and clichéd. Frankly, London was no Miss Marple; she wasn't even Nancy Drew. Her methods were silly and the conclusions she kept drawing were stupid. She seems to solve the murder almost by accident. There were frankly unbelievable things happening, such as the fact that the police would not have closed off the murdered person's stateroom, or that the head of the cruise line would have ordered London to interfere in a police investigation. The main character was also terribly judgmental; she might, for good reason, dislike a passenger's behavior, but if another employee said aloud what she was thinking, she suddenly felt uncomfortable about that employee. She constantly remarks to herself how wonderful she is at her job--yet her subordinate seems to do most of the work.
So I rate it two stars for the descriptions of Budapest, one for decent writing, but nothing for the mystery itself.