A new adventure for the Cabin Creek cousins! Jeff (13), David (11), and Claire (10) fly to Gray's Beach, California to spend the summer with their cousin Bronte Bella (13). Home of the GPO, Giant Pacific Octopus, they hope to see one up close. Their curiosity is sparked further when they learn about ancient cave drawings in one of the shoreline cliffs: a sea monster with eight arms sinking a canoe. Did this really happen or is it just a legend? When a shadowy creature bumps their little boat then swims into a forest of kelp, they have another mystery to solve! ** Bronte's Book Club introduces Bronte when she moved from New Mexico to this small town by the sea.