Mona Christie – Tom Christie's wife and Malva's mother, suspected of being a witch. When Tom was sent to Ardsmuir, he entrusted his wife to his brother Edgar's care; Mona seduced Edgar, who impregnated her; she later killed him.

Who got Malva pregnant?

Later, after Claire has returned to the Ridge, she is confessor to Allan Christie, who explains that he was the one that fathered Malva's child, and then murdered her.

Does Claire believe Malva?

Claire does not believe Malva and lashes out but this makes her the prime suspect when the apprentice is found dead.