Problems of young love and a mystery are solved hand in hand in Northport, a New England sea coast town, and on an island off shore. Terry, fresh from her sophemore year at college, soured by a romance gone wrong, has come to Northport to forget faithless Rory and to be near the island she has inherited from her inventor Grandfather. Going to explore, Terry and her friend Zaza, a budding actress, find evidence that marauders have been poking into the workshop and the lab. As matters progress, Dave Ballard, a young science teacher, comes to help Terry out and they discover that her grandfather's former business associate has been trying to beat them to the as yet unrevealed plans for a simplified airplane instrument panel. And as science is advanced, so does Terry's heart- towards Dave. Light.