Playwright and Director Mark Shanahan’s A Sherlock Carol at the Westport Country Playhouse in Westport, Connecticut is a delightful mélange of Charles Dickens’ A Christmas Carol (published in 1843) and Sir Arthur Conan Doyle’s Sherlock Holmes (published in 1892). The result is an engaging story that will have you on the edge of your seats trying to solve “the crime.” We had the pleasure of seeing A Sherlock Carol again at the Westport Country Playhouse on opening night, Tuesday, December…