Christie had me fooled with this one; I didn't guess either of the reveals at the end.  It moves quickly and it is clever.  Unfortunately, the two main characters fall pretty flat for me, and no one else gets more than a scene or two, so there is not a lot to hold on to.  I think the book should have been longer and had more time for the characters to breathe.  Luke and Bridget are apparently passionately in love after about three days, but admit that they don't like each other. (I don't like either of them either.) By the end though, they love and like each other.  Christie has a real issue with instalove in her mysteries.  Characters meet, talk twice, and then get engaged by the end of the book, and usually run off to somewhere in Africa.  The main strength in this one is the mystery's resolution and I would say it is worth checking out for that reason. TW: it's all very vague with references to orgies, but I couldn't tell if there is homophobia in this or if people were down on a character because of the orgies, which women were presumably participating in as well.