Grizzly Island: Calamity Creek Mysteries 5

When Zack and Rachel Granger are caught in a sudden storm, they find themselves stranded on a remote island somewhere in the Canadian Gulf Islands off the coast of British Columbia. Grizzly bear warnings force them to find shelter in an old lighthouse, but wailing winds in the tower and a secret tunnel beneath the creaking floorboards lure them toward something even more dangerous than the grizzly. Can they escape in time?