Authorities in Denver are searching for a burglar who reportedly stole 14 comic books—totaling a little over $42,000—from a comic book store in the city and apparently badly cut himself in the process.

Denver police said the thief had a good idea of what they were searching for and smashed through three panes of glass early Sunday to steal Mile High Comics’ gems, which included an autographed Spider-Man comic book, the Denver Channel reported.

At one point, the thief apparently suffered a cut and tried to clean up blood with cleaning supplies in the store.

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“Whoever did it knew what they were going for,” William Moulton of Mile High Comics told the Denver Channel.