It was okay! I didn't really like the main character. He was kinda arrogant and annoying.  The humor missed for me.  The mystery was fun and interesting but I did actually guess the twist long before it was revealed. It seemed very inspired by And Then There Were None.
It kinda read more young adult through the whole thing,  and it very well could be, if you just cut out some of the unnecessary sexual stuff.
Very middle of the road!