I first mistook David Gilbert’s second novel for the sort of corduroy-sleeved family saga at which American writers excel. The main character, Dyer, is an elderly author gathering his sons about him in Manhattan after the funeral of a boyhood friend, Charles. There’s Richard, a Hollywood screen hack whose teenage journal Dyer lifted for a prize-winning novel; his half-brother Andy, 17, on a mission to pop his cherry with Dyer’s sassy young agent; and Jamie, a documentary maker whose time-lapse footage of an ex-girlfriend’s death from cancer has gone viral.