How Toni Collette’s turn in the year’s scariest film lends ‘Hereditary’ its terrifying power

Toni Collette wasn’t looking for darkness when “Hereditary” came calling. But when the darkness found her — in the form of the unnerving saga of the Grahams, an American family haunted by tragedy, mental illness, and perhaps something supernatural — the opportunity was too delicious to pass up.

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