Cover of What Was the Staggering Secret of the 13th Floor?

Issue

What Was the Staggering Secret of the 13th Floor?

Overview Market Data Discussion

Market Data

PRO

Fair market values, graded census, and full sales history — for every cover and printing.

Sign in

Already PRO? Sign in to view.

Your Comic Collection Awaits

Join thousands of comic enthusiasts tracking their collections,<br>discovering new series, and connecting with fellow fans.