Dr. Frank Linden has a life-size, anatomically correct Mannequin in his office which he calls "Pin". Via ventriloquism, Dr. Linden uses Pin to teach his children, Leon and Ursula about bodily functions and how the body works in a way the children can relate to without it being awkward. Dr. Linden's interactions with the children are otherwise cold and emotionally distant, and his ventriloquism act is the only sign of a more warm and playful side to his nature. Unknown to Dr. Linden, Leon is mentally ill and has come to believe that Pin is alive. Due in part to his mother, who discourages Leon from playing outdoors or bringing anyone home, Leon has no real friends and sees Pin as the closest analogue. Leon is further traumatized when he secretly witnesses his father's nurse use Pin as a sex toy.