The Trials of Apollo is, at its core, an amazing series that so many people enjoy. If you liked other series by Rick Riordan, you will definitely love this one as well.
In this series, Apollo, a Greek God and an Olympian, is cast down from Olympus as a regular mortal, and he must learn to live life, not as a God but as a human. He faces challenges, evil Emperors, and a massive snake, capable of changing the future. Apollo feels how it is to be human, and he cannot make mistakes, so that he does not endanger his own, and others lives. He sees how other people suffer for him, for his own future, and he finally learns, after millenia of existence.
When reading this series, I enjoyed every bit. I was amazed by the detail, suspense, and characters. I was blown away by how all components and parts came together, to form this great series. This series easily earns a 5 Star rating from me. I think that kids and adults alike can read this series, and enjoy it a lot, but I think the main age category for this series is 8 - 10.