Q.E.D. (1922) is a mystery novel written by Lee Thayer. The story revolves around the murder of a wealthy businessman, John Ferguson, who is found dead in his office. The investigation is led by Detective Fleming Stone, who is assisted by his friend and amateur detective, Philo Vance. As the investigation progresses, a number of suspects emerge, including Ferguson's business partner, his secretary, and his wife. The detectives must navigate a web of lies and deceit to uncover the truth behind the murder. Along the way, they encounter various obstacles, including false leads, red herrings, and unexpected twists. Ultimately, they are able to solve the case and bring the killer to justice. Q.E.D. is a classic example of the detective genre, featuring intricate plotting, clever clues, and a satisfying resolution.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.