Luke garner is a third-born in a restrictive society that allows only two children per family. Risking his life, he came out of hiding to fight against the population police laws. Now, in the final volume of Margaret Pet...Luke garner is a third-born in a restrictive society that allows only two children per family. Risking his life, he came out of hiding to fight against the population police laws. Now, in the final volume of Margaret Peterson Haddix's suspenseful shadow children series, luke inadvertently sets off a rebellion that results in the overthrow of the government.