Decades ago, a malfunction at a pesticide factory released a toxic cloud onto the residents of Darkhill. Every year since, a young girl wearing a gas mask has haunted the town. She just wants be somebody's friend, but a single touch of her poisoned fingers can prove fatal. When she shows up again, the Darkseekers are on the case. But they quickly realize they've underestimated how determined she is to make a new friend...