Okay...about half way through, and-are you kidding me? Our most entertaining narrator, Percy- isn't narrating. In fact, only ONE from the original series is- and does Nico even count? Is this really the last book? Don't we want to hear what PERCY AND ANNABETH have to say about the ending of THEIR SERIES?!? Frustrating.
Serena I do know the short Percy Jackson and Kane Chronicles crossovers take place after Blood of Olympus, presumably Magnus Chase is the cousin of Annabeth and his series will be involving the Asgard gods in 'The Sword of Summer'.