A rash of pranks and mysterious accidents at an old ski lodge is investigated by teen-age sleuths who finally discover the surprising culprit.

While visiting her friend's grandparents on Cape Cod, Kate Clancy determines to find out who has been stealing small objects from the house, only to uncover a much more dangerous plot.

Fourteen-year-old Kate Clancy, a summer counselor at Camp Windingo, encounters some frightening and unsettling events and finally confronts a dangerous thief.