1 1/2 stars - because entertaining at times, but among the worst prose I've ever read. There is no (literary) style whatsoever. Occasionally you get the feeling it was written by a first-timer who has never read a decent book in his/her life. His/her...well not that it matters, but it's certainly interesting that you wouldn't notice the author is female if you didn't know. Her male gaze when it comes to describing women is very well-developed. Basically, most of the women present some kind of sexual threat/temptation to the main character, a psychiatrist/hobby detective who is very eager to keep a professional distance, but not always succeeds, which does not really pose a problem because he is a decent thoughtful guy. At times it's actually almost sweet.
The further in you are, the more ridiculous it gets in every respect. I wouldn't recommend this book to mystery aficionados either - there is some suspense at the beginning, but eventually the riddle gets solved on a few pages, and neither is it engaging nor shocking, just ridiculous, (it made me laugh out loud) which also has a lot do with the way that book is written - in that bland, bland, boring style with just few interesting observations. The only redeeming point of that book is its slight entertainment factor and the fact that it's just about 150 pages long. An easy read.