When those two enthusiastic fishermen, Djuna and his friend Tommy, are offered a chance to spend the summer at fish-filled Silver Lake as the guests of Miss Annie Ellery, they are overjoyed. But great as the fishing proves to be, there is more in store: Silver Lake holds a mystery and the boys find themselves swept up in a series of exciting and dangerous adventures, including an abandoned ice-house and two fires, as they help to solve it.