The auction's book expert is over the moon to have the magical donations: "To be entrusted with one Harry Potter first edition to sell is unusual enough.
"But to have three in the same sale and to be offering them for charity is a coup!".
The Philosopher's Stone alone is expected to make about £8,000 to £10,000 in the auction. But the signed sticker added to that could make an extra £5,000!
First edition Harry Potters are like gold dust, especially ones of Philosopher's Stone.
Ones in good condition, like those in this auction, are very rare and can be really valuable.