Abstract: A tonneau cover connected by a power driven linkage to the decklid of a vehicle is disclosed. The tonneau cover is movable from an extended position covering a storage well for a convertible top or retractable hardtop of a vehicle to a tonneau stowed position wherein the tonneau cover is suspended below the decklid of the vehicle. The linkage system includes right and left side linkages each of which include a four bar link made up of the tonneau cover, a cylinder mounting bracket, a front control link and a rear control link. The linkage is driven by a hydraulic cylinder through an arc of approximately 180°. The hydraulic cylinder is movably mounted on a cylinder rod that is mounted to the decklid.