Here is a thrilling novel by the author of The Planet of Peril and The Prince of Peril--the tale of a strange civilization the world had forgotten, and of the destiny that fell upon Tam, son of the Tiger. Illustrated.
A popular pulp era writer who served on the original Weird Tales editorial staff & appeared frequently in the magazine's early issues, Kline is perhaps best known for his novelistic feud with Edgar Rice Burroughs. He wrote "Planet of Peril" (1929) and two other novels set on the planet Venus and written in the storytelling form of the John Carter of Mars novels, prompting Burroughs to write his own stories set on Venus. In return, Kline wrote two novels set on Mars, as well as several jungle adventurers quite reminiscent of Burroughs's Tarzan.
In the mid-1930s Kline largely abandoned writing to concentrate on his career as a literary agent (most famously for fellow Weird Tales author Robert E. Howard, pioneer sword and sorcery writer and creator of Conan the Barbarian). Kline represented Howard from the Spring of 1933 until Howard's death in June 1936, and continued to act as literary agent for Howard's estate thereafter.
I was just looking at a list of SF/fantasy novels published by Avalon Books, many of which I read as a boy, when this title leapt out at me. I don't remember much about the story, but I sure do remember that name. I'm sure I liked it, because I got uncritical enjoyment out of just about all the adventure stuff I devoured at that age. This one seems to have been a sort of variation on Tarzan. Can't honestly say I'd recommend it, but I'm sure glad to have been reminded that I once read it.