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 three brothers, in their 50s and 60s, did not wish to be identified due to the windfall involved nor did the buyer of the comic book, according to the auction house.

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 hou

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