Небо
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Look, I've cracked the clue. The first link in Google when you search for "cleared table" leads to some story called "Pentagram." We look at Hostor's signature, and in big red letters, it says REDRUM. We enter that into the search, and it gives us a song by the band Pale Forest, a band from Norway. And Norway is considered the birthplace of black metal, and black metal is about devil worship, Satanism, and occultism, so you can't do without pentagrams here.