Conspiracy Club is a good mystery before you even know what the crime actually is or who the suspect(s) is/are; the reader spends some time trying figure out whether there has even been a crime.
I have been an Alex Delaware fan since "When the Bough Breaks" but after reading 10 or so there is a sort of predictable if comforting formula. Conspiracy Club was nearly as much fun as the "first time". So while there is a psychologist-protagonist, he isn't Delaware, he has a different set of friends, he is not as personally cool as Deleware and he doesn't live in Los Angeles. And, face it, Saturday Night Live's satire on Californication echos of Alex Delaware's Los Angeles. So, this was a good solid mystery, with lots of good twists, with a different set of characters and context. Fun.