We all know the new series will revolve around the new Great Prophecy Rachel made in the end of The Last Olympian. Nobody can be sure what it means, but these are some theories and opinions about its meaning.
"Seven halfbloods should answer the call
The meaning of this line seems quite obvious. The problem is who are the seven halfbloods? The new characters we met in the sample chapters - Jason, Leo and Piper - are most likely to lead the group. Rick Riordan promised he wouldn't throw too many new characters at us, so we may meet some old characters from PJO, such as Thalia, Nico, Clarrise,...
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