I don't usually take time to review books. Tom was a fun read. Not overly realistic, however. I'm more in favor of realistic fiction. That said, it was "fun" as I said before. Most everything goes well for Tom. Heck, he gets not one, but three women in a mini-harem. He is accepted by the leaders of the Cave. His plans work out almost perfectly.
I don't have a big problem with his unexplained ability to understand a language he had never heard before. Heck, I accept "warp" drive in space sci-fi, so it's not much different as far as I can tell.
The author does a good job with his characters, and just his story telling, so I will read the next in the series, probably the whole series. It's light, fun, and easy reading.