Here are two standalone novels from the queen of mystery, Agatha Christie. From the sprawling Leonide family to dark moors, no one can spin a mystery quite like she can.Crooked HouseThe Leonides are one big happy family living in a sprawling, ramshackle mansion--that is, until the head of the household, Aristide, is murdered with a fatal barbiturate injection. Suspicion naturally falls on the old man's young widow, fifty years his junior. But the murderer has reckoned without the tenacity of Charles Hayward, fiance? of the late millionaire's granddaughter.Endless NightStrapped by a chauffeur's wages, Michael Rogers is in want of a better life that seems out of reach. Especially elusive is a magnificent piece of property in Kingston Bishop--until a chance meeting with a beautiful heiress makes his dreams possible. Marrying her is the first step, and building the perfect home is the next. Unfortunately, Michael ignored the local warnings about the deadly curse buried in the tract of land, and living out his dreams may exact a higher price than he ever imagined.Endless Night was praised as one of Agatha Christie's most unusual forays into gothic, psychological suspense. A novel of fate, chance, and the nature of evil was a personal favorite of the author's as well.