This isn't exactly a detective novel. I mean yes, the characters are all PIs, but the book spends most of its time developing the characters and doesn't introduce a mystery until halfway through.
That being said, I did quite enjoy the book - the characters were funny, and I enjoyed the inclusions of lists. I did not really sympathize with the main character, but I did find her surprisingly believable. At the end there is a bit of a shocking twist, which I'm sure will be dealt with in the later books of the series. I thought it was an excellent debut novel, and I would recommend it for anyone who enjoys light humorous fiction.