The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Third Series, Vol. 1, Part 2, Nos. 1&2, Periodicals, 1946-1947.
A fading Hollywood starlet has her agent pull off publicity stunts to return her to the limelight, but when she is kidnapped by several thugs (and Freddy along with her), it's Captain Marvel Jr. who convinces the starlet that she has overcome the kidnappers, thus winning herself a ten-year movie contract.