In 1915, thirteen-year-old William is sent by his mother to spend the summer working with an eccentric inventor, Alexander Graham Bell, and his crew in a tiny Nova Scotia town.
Sam and Beth visit Oak Island for the first time since a mysterious fight between their mother and grandfather three years earlier to find Grandpa obsessed by a hunt for a two-hundred-year-old treasure, and it is not long before the entire family has joined in the quest to find the treasure and solve the mystery of the human skull turned up during their quest.
Jonathan, sent to live with his grandparents when his con-artist father goes into hiding, must make the difficult choice between running away or standing for a new and better life.
Ian is too busy pursuing his passion for social justice to be concerned about the issue of new school uniforms until he realizes the two issues might be related.
DJ, David McLean's eldest grandson, plans to climb Kilimanjaro to scatter his grandfather's ashes, but he faces numerous obstacles and finds that success is more difficult than he expected.