Bound by blood

Harry Potter is dying.

After a series of unexplained seizures, Hogwarts' professors discover that Harry is suffering from a rare and incurable magical disease-one that is slowly consuming his magic and will soon claim his life. As Hermione searches desperately for answers hidden within the castle's oldest books, and Ron struggles to understand the changes in his best friend, Severus Snape is forced to make an impossible choice.

To save Harry, Snape turns to an ancient form of magic that should never have been used.

Harry survives.

But survival comes at a price.

As strange new instincts, heightened senses, and an inexplicable connection between Harry and Snape begin to surface, both are forced into a bond neither wanted nor understands. With the wizarding world growing increasingly unstable, Voldemort still at large, and Cornelius Fudge determined to ignore the truth, the secrets surrounding Harry's cure threaten to unravel everything.

Some debts are paid with gratitude.

Others are paid in blood.