Mysteries seem to find the Red Blazer Girls: when Sophie finds a secret message in the antique fountain pen she bought for her father, the girls are on a case.The pen's original owner is a man full of secrets. His house is full of puzzles, and the Blazers will do anything to get to the bottom of things.
With their father en route to Africa for Doctors Without Borders, city-kids Nicholas and younger twin sisters Haley and Hetty are off to spend the summer with their Great-Uncle Nick at his house on Forsaken Lake. Nicholas discovers an old movie that his father made as a boy: it tells the story of the local legend, The Seaweed Strangler, but was never finished. Before long Nicholas wants answers both about the legend, and about the movie.