This is a Calvin and Hobbes wannabe and it fails. It also has elements of Minecraft in it in that this area looked like a series of giant stacked flower boxes straight out of Minecraft's lack of design workshop. I learned later that it was supposed to be a cliff! The art other than that, by Bannister, wasn't bad. The stories by Grimaldi were boring and uninventive.
The story is of Neanderthal kid Tib, who has a birthmark in the form of a red splash around his left eye. Other kids constantly make fun of him because of this. He's friends with a dinosaur (the Hobbes of the duo) named Tumtum, which animal his mother detests because she thinks it's dangerous. Well, it is to bird chicks, because this one poor nestling who fell out of the tree was swallowed whole and eaten by the dinosaur without a second thought.
The entire graphic novel is a series of one page cartoons retelling the same stories of cruelty and stupidity and bullying and loneliness over and over. The kid is bullied by his peers, or he plays with the dinosaur. His parents are largely absent and don't seem to care how miserable the other kids make him. The story is a disgrace and therefore warty.
Anyone who thinks humans and dinosaurs ever lived at the same time in history is a moron, period. I'm not going to recommend a book that panders to that while at the same time offering nothing to ameliorate it and make it worthwhile suffering this fictional lie. If it had been a sabertooth cat for example, in place of the dinosaur, it would have made more sense, but I'm guessing that the authors didn't do that because it would have shown exactly how much of a cheap rip-off of Calvin and Hobbes this book truly is.
The book doesn't even attempt to teach any history with all of the people having a modern mindset and using a modern vocabulary. All the author did was to take the laziest way out possible: put modern people into stone-age times, add an anachronistic dinosaur and hope people will (literally) buy it, without making any attempt to offer anything original, educational, inventive, fresh or new. Why not rip off the kids? It's pathetic.