The Dream Thieves

Now that the ley lines around Cabeswater have been woken, nothing
for Blue and Gansey will be the same. Ronan is falling more and
more deeply into his dreams ... and his dreams are intruding more
and more into waking life. Gansey is needed at home, and is struggling
to stay in Aglionby. And Adam? He's made some new friends.
Friends that are looking for some of the same pieces of the puzzle
that Gansey, Blue, and Ronan are after. Great power is at stake,
and someone must be willing to wield it.