A Superior Death

In her second appearance, after Track of the Cat , National Park Service ranger Anna Pigeon is posted to an island in Lake Superior, where her interest in wildlife is fully engaged by the local population of humans. Two scuba-diving tourists exploring an old, submerged wreck discover a recent addition: the body of Denny Castle, who ran a commercial diving concession in the park. This makes Anna uneasy about the mysterious disappearance of Donna Butkus, wife of fellow ranger Scotty Butkus.