Riddle of the Gods is the riveting fourth novel in the bestselling series chronicling the life and adventures of one of Norway's most controversial kings, Olaf Tryggvason.

It is AD 976. Olaf Tryggvason, the renegade prince of Norway, has lost his beloved wife to a tragedy that turns the lords of the land he rules against him. With his family gone and his future uncertain, Olaf leaves his realm and embarks on a decades-long quest to discover his course in life. Though his journey brings him power and wealth, it is not until he encounters the strange man in the streets of Dublin that his path to fame unfolds. And in that moment, he is forced to make a choice as the gods look on—one that could either destroy him or ensure his name lives on forever.