Hunt Across Worlds

CJ wrote up this adventure for her journal, though the M girls only come in at the end. It begins with two kids from Earth who discover a boy from another world being kept hostage. When they rescue him, they end up having to cross the USA before being blasted by magic to Mearsies Heili, where they meet a sailor girl who's been stuck in charge of a Mysterious Magical Object.
CJ and the gang try to come to the rescue, discovering that being on the edge of big events can lead to bigger questions . . . leading straight to the troubles chronicled in Fleeing Peace.
First written when Sherwood Smith was a teen.