Harry Potter, fleeing Sirius Black's death at the Veil, dives through after him. The Veil — ancient and aware — recognises him as the Peverell heir and forcibly unites all three Deathly Hallows within him, physically remaking his body and heightening his senses. He and Sirius emerge in an alien world called Alagaësia, armed with a shadow-blade. Far away, an ancient Eldunarà stirs.