How to dress, according to the book: Ira Levin wrote, "Rosemary got out of bed, slid her feet into slippers, and put on the blue-and-white quilted housecoat she had bought for the hospital . . . She then went into the kitchen and, from her knife rack, took the longest sharpest knife — a nearly new carving knife with a curved and pointed steel blade and a heavy bone handle with a brass butt."
How to act: Rosemary is so paranoid and terrified, and for all the right reasons. Carry that knife around and determine that you'll get to the bottom of your mysteriously vanished child.