Rick Riordan.

Credits to Rick Riordan. This Percy Jackson and the Olympians series is seriously nice. It's simply adventurous, overwhelming and interesting. The recommended series:

The Lightning Thief



The Sea of Monsters



The Titan's Curse



The Battle of the Labyrinth



The Last Olympian

And.. FYI, the author of this awesome series, Rick Riordan, has written another series called The Kane Chronicles. Well, this series talks about two protagonist siblings, named Carter Kane,14, and Sadie Kane,12, who are descendants of Ancient Egyptian Magicians. The book cover:

However, Rick Riordan only has written the first book and apparently, he's working on the second book. How many books will it be in this series? Unknown.