Svetoslav Donchev Slavchev (December 18, 1926, Lukovit – November 13, 2016, Sofia) was a popular Bulgarian science fiction and mystery writer, famous also as a journalist.
His most famous crime novels are: Nine, the Number of the Cobra ("Devet, chisloto na kobrata", 1977) and The Name of Death is Centaur ("Smartta se naricha kentavar", 1984).
[2][3] As the second editor of the widely read magazine Cosmos he invented and started publishing the riddle-like stories of the now famous police inspector Strezov.
His awards include the prestigious Bulgarian national science fiction prize Graviton (2000) for his whole contribution to the genre.
[5] In 2018, an anthology of the best stories with inspector Strezov was published to commemorate the 50th anniversary from the character's creation, this time with the illustrations of the author's friend Alexander Vachkov.