Sotheby’s might want to send a bidding paddle to Da Vinci Code author Dan Brown. In its July 7 London manuscripts sale, the auction house is offering a 1,500-year-old biblical document that includes layers of text and meaning–in three languages. Known as the Codex Climaci Rescriptus, the piece was written over the span of three centuries and stowed in a sacred monastery until landing in the hands of a pair of British twins by way of local Egyptian dealers. Now an English college is cannibalizing its library and cashing out, to pay for some building renovations. The ancient manuscript could sell for close to $1 million, according to Sotheby’s estimate.