Adam and Ronan get together oh-so-slowly, because of Adam's doubts. Really lovely - great characterization, and it made me all teary and heartclenchy for them.
"He wanted you to tell him, and he found out instead." Ronan made a frustrated noise. He probably felt that Gansey was upset with him, which meant they were fighting, and one of the few people Ronan never fought—not like he fought other people—was Gansey. The others were Matthew and Chainsaw. Ronan and Gansey need to work out some stuff once Ronan and Adam are together. Aw boys.
Unfinished business needs to be resolved before Blue and the boys can safely enter the cave by the dreaming tree in Cabeswater. Reads just like the books.