Sherlock's Last Case by Charles Marowitz

A young woman arrives at 221B Baker Street to warn Sherlock Holmes that her brother is planning to kill him; apparently in revenge for the death of his father whom he believes Sherlock Holmes murdered! Employing all his powers of deduction and the self-assurance that he’s always right, Holmes and Watson embark on a bizarre and fascinating case that eventually brings Holmes face-to-face with this avenger. Will this be the end of the most famous detective in the world?

A comedy-thriller with more twists than a demented corkscrew.