Wealthy socialite Veronica Vreeland returns from Central America, bringing tiny handmade dolls for all her friends. According to native legend, once placed under a pillow, the dolls do the sleeper's worrying for them. Unknown to Veronica or her guests, each of the dolls was made by the Mad Hatter, and contains a tiny microchip which plants hypnotic suggestions inside the sleepers' brains.

Not only has Poison Ivy been released from Arkham Asylum, but she's also married to her doctor and settled down to help him raise his two sons. It would appear that Ivy has gone straight and that her old days as a criminal are over. But wealthy bachelors are being struck down by an unknown toxin, leaving Batman to question Ivy's innocence.