Two loving Jewish families live at the Winkler house: "Abovestairs" are the Winklers themselves; 'Belowstairs'--under the floorboards--is the Mouse family. All the inhabitants are anticipating Passover, but the Mouse family's preparations are in crisis: the Winklers have put their matzah in a new, impenetrable tin ('Nobody could chew through that, ' says Grandpa Mouse), and how can the Mouses have their Seder if they can't forage for matzah? Leave it to the youngest, smallest members of each family--Eli Winkler and Miriam Mouse--to solve the problem: they turn the ancient ritual of finding the afikoman into an opportunity to restock the Mouses' matzah supply. Meyer's breezy, brief text lifts the story, and Engell's wide-eyed, anxious mice should resonate with readers experiencing their own family's holiday-related shpilkes. --Publishers Weekly