A man's dying wish is for the people in his life to participate in a 450-mile charity bicycle ride through Northern California.

Holmes is approached by Miss Violet Smith with a most peculiar problem. She has recently accepted a position with Mr. Carruthers as a music teacher for his 10 year old daughter. On Saturdays, she returns to her home to he with her mother and returns to Chilton Grange Manor on Mondays. She cycles the several miles to the train station and recently she has noticed a man, also on a bicycle, following her. He is quite blatantly there, stopping when she stops and always keeping the same distance from her but making no attempt to to hide his presence. She is worried at least in part because she recently rejected the advances of a Mr. Woodley who became upset and violent at the rejection. As Holmes soon deduces, she has good reason to be fearful, though not necessarily from the cyclist.

Mathematics textbook for the 5th grade. According to the conditions of the problem, every day a Pedestrian goes from point "A" to point "B", on the way he meets a Cyclist. Then he returns home, where his faithful wife is waiting for him. The next day everything repeats. But one day the Investigator stops the Pedestrian and reports that the Cyclist has disappeared. The Investigator asks the Pedestrian to go with him to point "B" in order to interrogate witnesses and figure out this complicated story together.

After two women poison the blackmailer who has been tormenting them, they wind up at the house of a blind man whose eccentric guest believes he has built a working time machine. Soon, the blackmailer is back to torment them all.

"The Unknown" was the final entry in Columbia’s I Love A Mystery series. A woman hires two detectives to keep her alive long enough to claim her inheritance.

See you soon 40 years old, David Zimmerman is a photographer but no one knows. While he almost never leaves home, friends drag him to a crazy party. He spots a woman in the crowd, can't take his eyes off her, follows her... In the middle of the night, his life changes. David wakes up... in the body of the unknown.

Zurich-born Hugo Koblet was the first international cycling star of the post-war period. He was a stylist on the bicycle and in life, and a huge heartthrob. Koblet had a meteoric rise and won the Giro d'Italia in 1950. Once he had reached the zenith of his career, Koblet was put under pressure by overly ambitious officials and ended up ruining his health with drugs. In 1954, he married a well-known model and they became a celebrity dream couple. After his athletic career ended, Koblet began to lose his footing. Threatened by bankruptcy, he crashed his Alfa into a tree.

Mary Boyne, who made shirts at four dollars a week, had no place for love in her life - only despair and hate for the son of the man who had plunged her family into deepest distress. Peter Kenwitz loved Mary, but because he was a mathematician and a pessimist by trade, his love was as hopeless as her chance for happiness.

Inventor Peter Marchmont has discovered a purple light that renders the user invisible. On his release from prison, Marchmont, disguised as Victor Cromport, uses the light to revenge himself against his former wife, Jewel, and her partner, James Dawson, who framed him for theft. Making himself invisible, Marchmont gradually ruins Dawson. He so wins Jewel's confidence and love that she is willing to kill Dawson at Marchmont's request. Finally, Marchmont leaves the scheming couple to their own misery and marries Jewel's sister, Ruth Marsh.