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. Hawk Bradshaw, who worked with Denny, suggests that there was a link between Denny and Donna, but Hawk is less revealing about the nature of the relationship he and his twin sister had with the dead man and the impact Denny's recent marriage (to yet another woman) had on it. The Bradshaws aren't the only reticent ones here; indeed, Barr's characters hide enough unsavory secrets to keep a soap opera humming for months.
