"Murder by the Clock," written by Rufus King in the late 1920s, is a detective novel that follows the story of Mrs. Endicott, who is deeply concerned for her husband Herbert's safety. Fearing for his well-being, she contacts the police for help, which leads to the shocking discovery of a dead body in his room.

As the narrative unfolds, Detective Lieutenant Valcour takes on the investigation, delving into the circumstances surrounding the murder. He explores the strained relationships and hidden secrets that may provide motives for the crime. At the beginning of the story, Mrs. Endicott is overwhelmed with anxiety about her husband, whom she believes could be in danger due to his involvement with a mysterious woman named Marge Myles.

During her conversation with Lieutenant Valcour, the tension mounts as his investigation uncovers various clues, including a threatening note and signs of a struggle. The chilling revelation of Herbert's body found in the cupboard heightens the urgency of Valcour's inquiry. This leads to a detailed examination of marital dynamics, possible motives for murder, and the shocking twists that unfold as the night progresses.