Heir to the underworld is a fantasy story written about fourteen heirs to the powers of the ancient Greek gods and their story adapting to the idea of their duties and responsibilities. Benjamin Darke, who is the god of the dead, does not bode well with the idea and finds it hard to take on the obligations that follow. Their names are picked to be gods based on them watching their generations, and Benjamin, the apprentice, has to show bravery and tolerance to succeed at his role.