McDonell's first novel, published when he was 17, was an acclaimed 300,000-copy bestseller—a daunting achievement for this emotionally intricate but iffy sophomore effort to match. The author of Twelve
, now 21, is a bit too experienced to be a boy wonder, but he's not quite a mature writer, a 'twixt phase that bedevils this novel about tragic family secrets, sibling madness and the abrupt onset of adult responsibility. Part one of the rat-a-tat-tat tale—most chapters are two or three pages—is set in Thailand, where Mike, a well-bred Harvard freshman interning for the summer at a Hong Kong magazine, is researching a story on stoned Western travelers. Part two takes place back in Manhattan as September 11, 2001, nears: Mike's quarrelsome parents are dead in a house fire and his revered older brother, perhaps responsible for the blaze, is prone to paralyzing hallucinations. McDonnell has a knack for capturing place with sharp-eyed, vivid prose: scenes set in Bangkok's whirl of sex and drugs, and his evocation of 9/11 disbelief and horror are both charged with a reality that's reportorial in its authenticity. But the two halves of the novel, linked loosely by Mike's search for the truth about his family, don't quite gel. Agent, Melanie Jackson. (Sept.)