The Adventure of the Lost Holiday

Solar Pons is a fictional detective created by August Derleth as a pastiche of Arthur Conan Doyle's Sherlock Holmes.
Robert
Bloch wrote of the series, "During a span of a century there have been
literally hundreds of Sherlockian imitations, ranging from parody to
direct duplication, but no one except August Derleth ever succeeded in
capturing the essential charm of Doyle's original concept.... To Pons's
exploits he brought not only expertise but evident expression of his
respect, appreciation, and affection for the source of their
inspiration. Viewed as Holmesian homage or as a character in his own
right, Solar Pons became Derleth's personal guide to an enchanted time
and place."