Veins Of Silver (HP)

Harry Potter was presumed dead after the attack by Voldemort. The wizarding world named him a martyr and moved on, happy that the threat of the dark lord was gone.

Years later, the Heir of Slytherin makes his presence known. But where did this mysterious figure come from? And how will his presence affect the wizarding world?
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a slightly AU Harry Potter. Hogwarts starts at 13. Harry is a year older than in Canon. Begins during summer before 4th year.