The Lost Hero takes us back to the world Rick Riordan made famous in the Percy Jackson series. This time Percy is nowhere to be seen but some of our old friends search for him while we are introduced a a new set of demigods, including Jason, whose memory has been mysteriously wiped. He (along with 6 other demi-gods - we don't meet them all now) is at the centre of a new prophecy about the usual sort of death, destruction and general mayhem as gods try to rise and conquer. I found the book readable but not compelling, though I'll probably read the rest of them since I like all that Greek and Roman god stuff. Recommended (if you like that sort of thing).