When the Spencers decided to take a family vacation, they called Reagan Dye, one of Mark’s students, to house-sit. One rainy evening, Rebecca asked Reagan to check the rain buckets in the attic. Reagan was nervous, but checked. The dog ran up the stairs behind her and disappeared into the darkness. When the attic door slammed shut (after she’d propped it open with a chair), Reagan freaked. When she ran down and saw a woman walking into Mark’s study? She sprinted out of the house to her car.