Trials of Apollo
The Trials of Apollo by Rick Riordan, sequel series to Percy Jackson and The Olympians and Heroes of Olympus
So a clarification: I try not peg the PJO world to a particular year in real time. The book Hidden Oracle is published in 2016. That does not mean the action is fixed to 2016, nor have I ever said or do I envision Blood of Olympus ending in 2010, so this "six years later" theory is not correct. The action of Hidden Oracle starts roughly six months after Blood of Olympus. Book time is not tied to real time. Hope that helps! Sorry if I confused you.