The Doctor is in trouble. He has his own race to win. Stuck in a parallel dimension, pursuing the mysterious Sabbath, he must unravel a complex plot in which he himself may be a pawn. Following the only lead, the TARDIS arrives on Selonart — a planet famed for the unique, friction-nullifying light water that covers its surface. A water that propels vast, technological yachts across its waves at inconceivable speeds. All in all, an indulgent, boastful demonstration of power by Earth’s ruthless multi-stellar corporations.