Red Pyramid- The beginning

I just started reading The Red Pyramid by Rick Riordan. So far, the only thing that has gone on is that the two main characters, Carter and his sister Sadie, have been introduced, along with their dad. Minor conflict and mystery has shown up, including learning a little bit about their mother's death and seeing their dad talking with strange people. I don't know too much just yet, but it is looking like it will be a good book.