The Gods of Mars by Edgar Rice Burroughs
My rating: 5 of 5 stars
John Carter, reluctantly transported back to Earth at the end of PRINCESS OF MARS, manages to get back to Mars after several years and ends up in the Barsoom forbidden zone fighting a slew of plant and ape monsters, and a surprise meet up with his pal the green Tars Tarkas the Jeddak of Thark. The novel then races at breakneck speed through fights, captures and escapes, and epic battles. ERBs world building skills are exceptional and he introduces more Barsoom races with their histories, imaginative foreign landscapes, and creatures. The character Thuvia is introduced and she will play a bigger part in the series going forward. Bear in mind that the stilted and florid early 20th century style of prose might pose a barrier to some readers. It’s clearly worth the effort to accommodate the language and enjoy this terrific sci-fi adventure novel.
This work is in the public domain and freely available from https://www.gutenberg.org/ebooks/64