Books like The Mischief Maker by Edward Phillips Oppenheim

Two young lovers, Tommy and Tuppence Beresford, form a private detective agency and are hired to locate a missing woman named Jane Finn, whose disappearance threatens post‑war Britain.

A pioneering English detective story in which a priceless diamond, once stolen from a Hindu idol and presented to a young woman on her eighteenth birthday, disappears again, sparking intrigue and danger.

Set during the French Indochina War, the novel follows British journalist Thomas Fowler, his mistress Phuong, and American idealist Pyle, whose ambitions and tragic fate reshape their lives amid political turmoil.

An independent heroine and a cunning aristocrat team up to outwit rivals and uncover a hidden treasure amid the intrigue of London.

John le Carré’s Cold‑War spy thriller follows British agent Alec Leamas as he takes one last perilous assignment to outwit East German intelligence.

INCORRIGIBLE! Spoiled, sassy and enticingly lovely, Heather Blair-Burns rightfully belongs among Boston's high society -- certainly NOT in a Dodge City saloon. But had the haughty, high-spirited debutante remained back East, she would have missed a daring train robbery, a reunion with her presumed-dead father ... AND the handsome, rough and rugged rogue who calls himself Morgan Stone. It's bad enough that evidence has linked Wells Fargo agent Stone to a string of robberies. Now he has to work undercover behind a bar and deal with the saloonkeeper's beautiful brat of a daughter -- an exasperating minx who would serve the customers lemonade and give the local soiled doves lessons in decorum. But love has a way of ambushing even the most mismatched of hearts. All it takes is a hint of passion -- and a touch of ... Mischief.