“My gracious!” breathed Phyllis. “Did you ever see anything so strange! What can it be?”
“And isn’t it beautiful!” added Leslie. “What can that queer creature be that’s carved on it? Looks to me like the pictures of dragons that we used to have in storybooks.”
“Let’s try now to get it open.”
After arriving at the seashore to care for her sick aunt, Leslie meets Phyllis, and the two girls become instant friends. When Leslie's dog uncovers a mysterious treasure box, they are eager to figure out where it came from and what it contains. Mysterious lights, shadowy figures, stormy nights, and threatening messages are no match for the determined youngsters who will stop at nothing to solve this mystery. Can they protect the box long enough to discover its secrets?