An artist sitting under a cliff bird watching is disturbed by the body of a young girl hurtling past. Instead of reporting it immediately, or going to her assistance, he continues sketching. He sketches the body. He becomes a suspect, though it is not certain whether she killed herself or was thrown from the cliff. The police doctor makes friends with him. Together, with the help of Sarah Fortune and other residents of the apartment building in which Richard Beaumont lives they piece events together and uncover the perpetrators of the girl's murder and the crime that has been going on under their noses.