What should be a quiet week at the beach turns into the most challenging mystery that Sam and Ally have uncovered yet. What’s the truth behind the odd family renting the cabin next door? Is the tale of a sea creature and haunted lighthouse just a myth? How does a missing girl and suspicious boat tie into all of it? The girls can’t solve this puzzle on their own, so they turn to their brothers for help.
Travel with them to the scenic Washington Coast and into the Olympic Rainforest, where the four have to work together to untangle the clues and fit the mysterious pieces together.