C L Moore's "The Tree of Life" (novelette, monster, free): Northwest Smith, always in the service of girls in trouble!
Here we see the interplanetary adventurer Northwest Smith trapped for food by Thag, a 4-dimensional monster, in the ruins of the ancient Martian city of Illar. He will, of course, escape trivially.
- Feedbooks has something labeled a parody of this story title "The Tree of Life Revisited" (download) but author name as "Cathan L Moore". I haven't read that.
- There is some Lovecraftian imagery & language here, but the influence might have ran in the opposite direction: "apparently Mr Lovecraft was a fan of Ms Moore's".
Fact sheet.First published: Weird Tales, October 1936.
Download full text from Project Gutenberg.
Download audio from LibriVox.
Related: Stories of C L Moore; Northwest Smith series.