Graves With No Names Created by Boltinoff & Kanigher, this final issue of Showcase tells several tales of the OSS (Office of Strategic Services) during WW II. "Graves With No Names" is set within Circus Mazurka.
The Friendly Killers Set in the world of underwater espionage.
Note: The final panel of the story presents a teaser for (the non-existant) Showcase #105, stating... "Next Issue: Starring Deadman on sale 3rd week in July!"
Another Pin -- Another Death! Tells the tale of the origin of a super-spy.
The World's Greatest Spy A 1-page "Critic's Corner" article about "Wild Bill" Donovan, the greatest super-spy of them all.
Onward And Upward A 1-page "DC Publishorial" that explains the comic book price increase from 35 cents to 50 cents.