"The twenty-six clues" by Isabel Ostrander is a detective novel written in the early 20th century. It centers on the brazen strangling of a young society woman whose body is staged in an eccentric “crime museum,” drawing together a proud scientific criminalist, an intuitive ex-policeman, and a zealous amateur collector as competing methods collide over a web of clues. The investigation spans two neighboring households, a blind French secretary, and a grieving husband, hinting at intimate knowledge, calculated staging, and secrets behind a polished social façade. The opening of the novel gathers Wade Terhune, ex-Roundsman Tim McCarty and his friend Dennis Riordan at Calvin Norwood’s home, where debate over scientific detection turns to shock when the Duchess-of-Piatra “skeleton” table instead reveals Evelyn Jarvis, freshly strangled with a blue scarf. Her blind acquaintance Victor Marchal identifies her by a distinctive perfume, Inspector Druet takes charge, and Evelyn’s husband Oliver arrives shattered. Terhune spots an unbolted museum window, a ladder outside, and a long black hair on the frame, arguing the body was brought in from the Jarvis yard through a door cut in the fence. At the Jarvis house, Margot the maid—nervous and evasive—claims a foreboding dream; the cook and butler were off until late, and a housemaid sulked upstairs with a toothache. Evelyn’s sitting-room and bedroom are pristine, but her dressing-room is torn apart and the wall safe forced—yet her finest jewels were in a bank and her engraved emerald ring was untouched, complicating the robbery theory. Back in the museum, Dennis discovers a high-quality, gasoline-stained chauffeur’s glove wedged on the ladder and then dislodges the missing “Duchess” skeleton from the chimney, leaving investigators convinced the murder occurred in Evelyn’s rooms and that someone well acquainted with both houses staged the grim display. (This is an automatically generated summary.)