After his parents are kidnapped, Henry York moves from Boston to a small town in Kansas. He lives with his Aunt, Uncle and three cousins. When a piece of plaster falls on him, Henry starts to poke at the exposed wall and finds 99 hidden cupboards. Each cupboard door is different in color, wood, and size. He and his adventurous cousin, Henrietta, discover the 100th cupboard in their dead grandfather's mysterious bedroom. The cupboards are actually portals to different worlds. The adventure begins when Henry begins to receive mail from the cupboard, Henrietta disappears in of the world in the cupboard and an evil- witch is released from cupboard. Will Henry find Henrietta before she is stuck in the cupboard world forever, and stop the witch from spreading evil in Kansas?