The second part of the Mystery at the Lake House continues after the cousins go home. Ian wishes that he and Amelia could see Anabell again. Suddenly they are transported to Anabell's bedroom. There they meet Swan Dancer, who the cousins had summoned when they were in Washington. Swan Dancer explains to them that the spirit world wants them to go back in time and solve a mystery.
Grandma is just another Grandma that doesn't get to see her grandchildren often enough, so she writes stories for them so together they can share adventures, even though it is only through the written words.