One winter day in 2013, nearly 250 members of an ultra-Orthodox Jewish group called Lev Tahor vanished from the remote town of Saint Agathe, Quebec. As Montreal Gazette reporter Jason Magder investigated, he heard concerning stories: of child abuse, of children taken away from their parents, and of people being sedated with antipsychotic drugs. In many ways, the story of Lev Tahor is one with more questions than answers: How has the group managed to evade the authorities for so long? How can authorities better work together across provincial and state lines to protect the most vulnerable? And, despite a series of criminal convictions, why does the group continue to attract followers?

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