Tolstoy said that all unhappy families are unhappy in their own way, but anybody who reads a lot of novels may well think they’ve seen every possible permutation of familial unhappiness. Not the least of Paul Murray’s many achievements in his fourth novel, The Bee Sting, is to take the overfamiliar dynamics of the stock “dysfunctional family” and make them seem fresh: for the Barnes family seem uniquely prone to making bad decisions and suppressing secrets. Set in a claustrophobically small town near Dublin, this Booker-longlisted tale is a family saga told from the viewpoint of each family member in turn, in the manner of Jonathan Franzen’s The Corrections. We begin with the two Barnes children, teenagers Cass and PJ,  both plotting, in different ways, their escape from the family home.…