The disappearance of an Idaho boy and his teenage sister last year has led to the arrest of their mother in Hawaii, a major development in a bizarre case that spans multiple states, includes three mysterious deaths and touches on the mother’s doomsday beliefs.

Lori Vallow, 46, also known as Lori Daybell, was arrested Thursday on an Idaho warrant and was being held on $5 million bail, according to police on the island of Kauai. Vallow has been charged with two felony counts of child abandonment that can carry a prison sentence of up to 14 years.