The world of Percy Jackson and many of the most popular figures to inhabit the popular young adult fantasy are revisited in this third "The Trials Of Apollo" book, in which the god Apollo is reduced to Earth-bound awkward adolescence, going by Lester Papadopoulos in this form. Gawky Lester must journey to the Labyrinth to be returned to godly form, but it quickly becomes apparent that the Labyrinth is at the centre of a destructive conspiracy he must use his powers to intervene in.