The Secret at the Gatehouse (Dana Girls Mystery Stories No. 9)

Louise and Jean become involved in another mystery when they meet Mrs. Zerbe, who used to work for Mr. Warrington, one of the owners of Captain Dana's ship. Mrs. Zerbe is devastated that she lost her job at Mr. Warrington's estate. During her conversation with the Danas, Mrs. Zerbe mentions a secret which she has kept for Mr. Warrington.