When a chamber in a mansion manifests a loud, eerie whistling, Carnacki is called to investigate. He makes an exceedingly thorough search of the room, but can find no explanation. He is still not convinced of the supernatural nature of the sound until he climbs a ladder outside and peers into the room through the window: the floor of the room itself is puckering like a pair of grotesque, blistered lips. He hears Tassoc, the mansion's owner, calling for help, and enters the room via the window.