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Blood Witch is the 3rd book in the Sweep series.
Blood Witch was first published on April 23, 2001.
Flustered from seeing Sky and Hunter in Cal's home, Morgan, wanting to get away from them, left the room and discovered a door hidden in the hallway. When entering the room, Morgan realizes that it is Cal's mother Selene Belltower's study. While glimpsing the thousands of books that marked the walls, Morgan becomes taken over by a sensation. Unconsciously, she pulls out a book with no title. Flipping through the pages she realizes that what she held was her mother's Book of Shadows. Amidst her overwhelming emotions Cal and Selene enter, perplexed upon how she was able to enter the secret room. At first feeling guilty, but seeing the Book of Shadows is rightfully hers, Morgan confidently opposes Selene and without any conflict Selene gives the book to Morgan. Morgan returns home.
From this point on Cal's respect and feelings begin to grow for Morgan. Tensions rise and things start to become unclear as little bits and pieces of information arise. Morgan discovers that she is Woodbane, Hunter is Cal's brother and he is a Seeker for the International Council of Witches investigating Selene and Cal. Morgan finds her birth mother's tools beneath their old house in Meshomah Falls, by scrying in the fire she sees her birth mother Maeve Riordan pointing under the house, so she drives there with her best friend Robbie Gurevitch to retrieve it.
Tensions further erupt on Morgan's birthday during her time with Cal when Hunter arrives. Cal and Hunter break into an argument which ends up becoming a chase. Hunter announces his reason for being there which is to fulfill his duty as Seeker. Cal runs into the woods with Hunter following behind and Morgan following. The two end up on the ground fighting, with a mixture of turmoil and despair from seeing Cal writhe in pain when Hunter manages to bind Cal with a silver chain, Morgan throws the athame she had received from Cal as a birthday present at Hunter. The athame strikes Hunter's neck and with a kick from Cal he falls over the cliff's edge.