Phantom of The Art Room is an episode in a series involving the character Mirra.
When a mysterious hero appears in Gravity Falls, Dipper is immediately interested in discovering his/her identity. Meanwhile, supplies from the Mystery Shed go missing.
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the cryptogram in the end credits is a keyword cipher, it reads:
FPNY OPHTFSJI, RPYFJQN PIN KBTHPQJI, YJUQ BTFK CR ITTNTN