Blue Detective: A Hotel in Scarlet

I have been following Detective Rio and her lovable, if not particularly witty sidekick Jules for some time now. Based on your interest in my previous stories, I know you have been eagerly awaiting the duo's next adventure...

They had been searching for the Blue Jewel for a while, and in their latest case, they uncovered an important clue: the bearer of the jewel, whose identity was unknown, had been spotted briefly at a hotel named "The Crimson Haven". Though, apart from that small piece of information, they had no concrete evidence. They were searching for the jewel on the orders of our great king, and they had no intention of returning empty-handed. But where was this mysterious hotel located? Who was it that held the jewel? And most important of all: what kind of trouble were they going to get themselves into this time?

The hotel's guests were travelers from all around the world. Some had been there for a few months, others for years. They weren't necessarily the kind of people you would want to make friends with. Perhaps you would play a game of bridge with them before your afternoon nap, and that would be that...