Not Sidney Poitier is an amiable young man in an absurd country. The sudden death of his mother orphans him at age eleven, leaving him with an unfortunate name, an uncanny resemblance to the famous actor, and, perhaps more fortunate, a staggering number of shares in the Turner Broadcasting Corporation. Percival Everett's hilarious new novel follows Not Sidney's tumultuous life, as the social hierarchy scrambles to balance his skin color with his fabulous wealth. Maturing under the less-than watchful eye of his adopted foster father, Ted Turner, Not gets arrested in rural Georgia for driving while black, sparks a dinner table explosion at the home of his manipulative girlfriend, and sleuths a murder case in Smut Eye, Alabama, all while navigating the recurrent communication problem: ''What's your name?'' a kid would ask. ''Not Sidney,'' I would say. ''Okay, then what is it?''