Unplanned vacation

Sherlock Holmes and John Watson are vacationing on a cruise ship where crimes have already taken place. But it's not just her new case that's important to her. Both get to know people they didn't know or people they knew but didn't actually want to see again: Watson wants to marry Cate, Mycroft Holmes is also there and Holmes' daughter?
Will the two of them solve the case?

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I am not liable for grammar and spelling errors!

The book was created in collaboration with @Reyla_me.