I never like Keigo Higashino's novels despite he is a darling of the Japanese publishers and his books are selling like crazy in many Asian countries. Many people praised him as a master of detective novels, but I never think his books are really up there with the other grand masters from the past generations.
Let's get back to the actual novel in hand, shall we? First it's a traditional murder mystery: the family head of a rich family and his mistress were found dead in the family manor, police suspected it's a crime done by someone from within the family. There're mistrust and many family secrets among the family members blah blah blah.
Mr. Higashino hadn't made any mistake in this book, the story is fast paced and effectively written but the characters and their relationships with one another are a bit flat (but I can live with it). But does it mean the story is charming or refreshing when I say "Mr. Higashino hadn't made any mistake"? No. There's nothing charming about the murder mystery and the characters, although the mystery is explained in a decent way, but in the end, it's a highly forgettable book.