Nico, the son of Hades, and his boyfriend Will, the son of Apollo, travel to Tartarus, the deepest, darkest part of the Underworld, as they attempt to rescue an old friend.

Michael Vey, a fourteen-year old who has Tourette's syndrome and special electric powers, finds there are others like him, and must rely on his powers to save himself and the others from a diabolical group seeking to control them.

Once again, Tucker Pierce and friends must fight for their lives against the better-equipped SYLO, and they will risk nearly everything to keep each other safe the battle's climax nears. While on the run from the SYLO team, Tucker, Tori and Kent are driven directly into another base of the invaders. They become prisoners, destined be conditioned to forget their old lives and turn on one another to survive. Drawn to a mysterious dome unguarded in...