Kodiak Island, Alaska, shaken by a series of earthquakes (like those which the author investigated in 1964), provides a solid grounding for Browning Norton's latest mystery-chase-capade. Hardly have Mark Kline, fourteen, and taciturn Air Force brother Carl reached Kodiak than Carl inexplicably goes off and, worse, doesn't return on time. Mark's on his way to the police when he's shanghaied to a fishing boat by Capt. Mort Domineux, who has a way of sounding like Long John Silver. But Mark is no sooner trussed up than a rescuer appears in the person of Aleut Indian Nikkio, also a vacationing ninth-grader, who's onto what's afoot. Seems that a blue plane crashed on nearby Swans Island with stolen bank funds aboard, and Carl is helping old friend Joe Catherine, an Aleut neighbor of Nikkio's, to locate the plane and claim the reward. In the complications that follow, old recluse Bob Beetles, another Treasure Island castoff, helps the boys cross impenetrable terrain and spot the plane; a tidal wave wipes out the Aleut village; and the reward money is committed to its improved reconstruction. Rapid-fire entanglements and a fix on local Indian life.