Gr 5–8—Elaborating on the ominous revelation that caps The Red Pyramid (Hyperion, 2010), this planned trilogy's middle episode sends dual narrators Carter and Sadie Kane from their newly established school for sorcerers in Brooklyn to the underworld realm of the Duat, leaving massive trails of destruction on their way to a first face-off with Apophis, snake god of Chaos. Given just five days to find the retired god Ra—god of order, or ma'at—before Apophis escapes millennia of confinement and destroys the universe, the squabbling sibs also have their own growing magical abilities to explore; hostile factions of both human wizards and Egyptian gods to battle; monsters to face; temptations to overcome; infatuations to work through; rescues to make; and, of course, plenty of digs, wisecracks, fashion notes, and teen chatter to deliver. Fortunately they have some sturdy allies—notably Bes, the god of little people and memorable for more than just his Speedo with "Dwarf Pride" written on the butt that is his battle costume. Despite helpful lists of Egyptian deities and terms at the back, readers unfamiliar with the opener may have trouble at the beginning keeping up with both the continuing plotlines and the teeming cast, but Riordan kickstarts the action, never lets up on the gas, balances laughs and losses with a sure hand, and expertly sets up the coming climactic struggle without (thankfully) ending on a cliff-hanger. It's a grand ride so far, showing nary a sign of slowing down.—John Peters, formerly at New York Public Library