Cynthia inherits her aunt's large estate and moves in. She reads her aunt's diary and finds out (and graphically imagines) how she was taught in the ways of love by her gardener in 1901 at the age of 21. She decides to continue the fruitful relationship to the personnel and gets it on with the handsome young gardener herself.

The stenographer Alice Sycamore is in love with her boss Tony Kirby, who is the vice-president of the powerful company owned by his greedy father Anthony P. Kirby. Kirby Sr. is dealing a monopoly in the trade of weapons, and needs to buy one last house in a twelve block area owned by Alice's grandparent Martin Vanderhof. However, Martin is the patriarch of an anarchic and eccentric family where the members do not care for money but for having fun and making friends. When Tony proposes Alice, she states that it would be mandatory to introduce her simple and lunatic family to the snobbish Kirbys, and Tone decides to visit Alice with his parents one day before the scheduled. There is an inevitable clash of classes and lifestyles, the Kirbys spurn the Sycamores and Alice breaks with Tony, changing the lives of the Kirby family.

Although his murdered friend was by all accounts a scoundrel a true "bounder" Edward Wales is determined to trap his killer by staging a seance using a famous medium. Many of the 13 seance participants had a reason and a means to kill, and one of them uses the cover of darkness to kill again. When someone close to the medium is suspected she turns detective, in the hope of uncovering the true murderer.

Charlie Mason and Rusty Fleming are star reporters on a Chicago tabloid who are romantically involved as well. Although skilled in ferreting out great stories, they often behave in an unprofessional and immature manner. After their shenanigans cause their frustrated city editor to resign, the publisher promotes Charlie to the job, a decision based on the premise that only a slacker would be able crack down on other shirkers and underachievers. His pomposity soon alienates most of his co-workers and causes Rusty to move to New York. Charlie resigns and along with gangster friend Smiles Benson tries to win Rusty back before she marries a stuffy society author.

When the fabled Star of Rhodesia diamond is stolen on a London to Edinburgh train and the son of its owner is murdered, Sherlock Holmes must discover which of his suspicious fellow passengers is responsible.