Rick Riordan’s bestselling Percy Jackson series is coming to an end.

The fifth and final of Rick Riordan’s million-selling “Percy Jackson and the Olympian” books, “The Last Olympian,” is coming out May 5, 2009. The first four adventures of the 12-year-old boy descended from a Greek god include such popular stories as “The Lightning Thief” and “The Sea of Monsters.”