Renowned children’s-book author Sara Young makes an ambitious foray into adult fiction with My Enemy’s Cradle, a tale of one woman’s survival during WWII. Half-Jewish Cyrla lives with her Dutch relatives in 1941 as Germany?s grip on Holland tightens. When the family grows increasingly concerned about Cyrla’s safety (and theirs), they hide her in one of the last places the Nazis might look: Lebensborn, a birthing center for Aryan babies. If the plot sounds unbelievable, well, it is. Beginning with Cyrla’s quick pregnancy to the unlikely ally who helps her escape, Young’s book gets bogged down in too many implausibilities. B-