A copy of the first Superman issue, unearthed by three brothers cleaning out their late mother's attic, netted $9.12 million this month at a Texas auction house, which says it is the most expensive comic book ever sold.

The brothers discovered the comic book in a cardboard box beneath layers of brittle newspapers, dust, and cobwebs in their deceased mother's San Francisco home last year, alongside a handful of other rare comics that she and her sibling had collected on the cusp of World War II.

She had told her children she had a valuable comic book collection hidden away, but they had never seen it until they put her house up for sale and decided to comb through her belongings for heirlooms, said Lon Allen, vice president of comics at Heritage Auctions. The brothers uncovered the box of

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