Man and woman searching in a dark cave by the sea, find hidden trove of weapons in a cover illustrating "The Island Avenger," by E. W. Manifold. Also: "Skating-Mad!" by Ben Peter Freeman, "Rubies for china," by Neil Martin, "A Plan for Murder," by Edward S. Williams, and "The Stallion's Choice," by L. P. Holmes.
Source: Dave Wills, who sells on eBay as dwills1000, and has an eBay storefront "Dave's Odds and Ends"
Restoration by: magscanner