In The Adventures of Sherlock Holmes, they solve the mysteries of copper beeches, a Greek interpreter, the Norwood builder, a resident patient, the red-headed league, and one final problem.
Many modern retellings, which draw inspiration for new stories or even remix multiple selections from Conan Doyle's originals. But the Adventures of Sherlock Holmes, and the many other editions released over about a decade, are straight-up, true to the source material, done well.
They can be tricky to find, but thanks to niche streaming services like BritBox, available both standalone and via Amazon Prime, Sherlock Holmes is available whenever you need your "genius detective" fix.