New York: The Century Co., 1921. Hardcover first edition - Story set on the lonely coast of New Jersey during the month of October, involving 2 girls who become friends as they try to solve the mystery of an unusual casket they found buried in the sand. Illustrated by C. M. Relyea with a frontispiece and 3 glossy plates. 253 pp. Bound in gray-green cloth with yellow lettering on the spine and front cover, and a silhouetted illustration of two girls and a dog on the front cover, a small dragon on the spine.