Since their mother's death, Carter and Sadie have become near strangers. While Sadie has lived with her grandparents in London, her brother has traveled the world with their father, the brilliant Egyptologist, Dr. Julius Kane. One night, Dr. Kane brings the siblings together for a "research experiment" at the British Museum, where he hopes to set things right for his family. Instead, he unleashes the Egyptian god Set, who banishes him to oblivion and forces the children to flee for their lives.

Jason has a problem. He doesn't remember anything before waking up on a school bus holding hands with a girl. Apparently she's his girlfriend Piper, his best friend is a kid named Leo, and they're all students in the Wilderness School, a boarding school for "bad kids." What he did to end up here, Jason has no idea—except that everything seems very wrong.

As the son of Hades, Nico di Angelo has been through so much, from the premature deaths of his mother and sister, to being outed against his will, to losing his friend Jason during the trials of Apollo. But there is a ray of sunshine in his life—literally: his boyfriend, Will Solace, the son of Apollo. Together the two demigods can overcome any obstacle or foe. At least, that's been the case so far . . . Now Nico is being plagued by a voice calling out to him from Tartarus, the lowest part of the Underworld.

Todo empezó en Londres, la noche en que nuestro padre hizo explotar el Museo Británico con un extraño conjuro. Fue entonces cuando nos enteramos de que, además de un reconocido arqueólogo, era una especie de mago del Antiguo Egipto. Rodeado de valiosas antigüedades, empezó a entonar extrañas palabras.... Algo debió de salir mal porque la sala quedó reducida a escombros; Set, el dios del caos, apareció de la nada envuelto en llamas y a nuestro padre se lo tragó la tierra.

Accepting employment as a governess after hard times hit her family, medieval scholar Rosalind Hawkins is surprised when she learns that her mysterious employer has no children and only wants her to read to him through a speaking tube.