It’s the children who must save themselves in No Passengers Beyond This Point (Dial, 256 pp., ages 9-12), a new novel by Newbery winner Gennifer Choldenko (“Al Capone Does My Shirts.”) India, Finn, and Mouse Tompkins think it’s bad enough when their mother tells them their house has been lost to foreclosure and they must fly to Colorado to live with their Uncle Red. But when their plane detours into a strange timeless zone en route, they discover that the real challenge in life may be learning to stand up for themselves.