Showing Trent's Last Case by E. C. Bentley

When a scheming American capitalist is found dead in the garden of his English country house, two immediate matters confound amateur detective Philip Trent: why is the dead man not wearing his false teeth and why is his young widow seemingly relieved at his death? The newly widowed Mabel Manderson, ‘the lady in black’ has a disarming effect on the refreshingly fallible and imaginative Trent, in this classic detective story that twists and turns as a result of the irresistible combination of ingenious deductions and misplaced assumptions.