You're All Aloneby Fritz Leiber
You're All Alone is also known as The Sinful Ones. It was originally published in "Fantastic Adventures" magazine in 1950.
THEY HAD A DARK TALENT THE WORLD HAD LOST...
Carr Mackay had an okay job, a beautiful woman and a lot of big plans - a pathway marked for himself through life. But one day he met a beautiful, frightened girl who didn't quite belong in this world. And something began. Irrevocably.
Something that diverted him forever from his path, shook the sleepy dust from his eyes and brought him to a startling confrontation with the furthest limits of life, death - and an alien, terrifying danger...
Details updated August 28, 2021
Fritz Reuter Leiber, Jr. (1910–1992) was an American author of fantasy, horror, and science fiction. The son of a pair of Shakespearian actors, Leiber was also an actor, expert chess player, and champion fencer. Born in Chicago in 1910, Leiber spent his youth touring with his parents' theater company. He graduated with honors in philosophy from the University of Chicago in 1932. Leiber married Jonquil Stephens in 1936. In 1938, their son Justin was born. After Jonquil's death in 1969, Fritz Leiber moved to San Francisco, where he died on September 5, 1992.