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.

Praise for Riddle of the Gods:
"Schumacher's imaginative plotting pushes his characters across the threshold of one fast-paced adventure after another and has me eagerly awaiting Book Five in this thoroughly absorbing series." - Historical Novel Society

"Having enjoyed the previous books in the series, I was even more impressed with this evocative tale. Kudos to the author. 5 Stars!" - Historical Fiction Reviews

"Schumacher delivers a compelling tale of loyalty and betrayal, and love and loss, in which Christianity vies against the old pagan ways as surely as the warriors battle for power and fame. Another great Viking novel from Schumacher." - Matthew Harffy, author of the bestselling Bernicia Chronicles and others.

"If you want to experience the Viking Age as it really must have felt, then read this book. I know of few novelists who can transport you there with greater skill and accuracy than Eric Schumacher. A gripping, intelligent novel of the Viking world." - Theodore Brun, author of The Wanderer Chronicles.

"A tale fit for a roaring fire, filled with treachery, battle, loss, and hope, Schumacher brings you front and center to the story of Olaf Tryggvason. Highly recommended." - Daniel Green, author of the award-winning Northern Wolf series.

"I highly recommend this multi-layered Norse adventure and action for its memorable characters, riveting battle scenes, and thought-provoking themes that will resonate in your mind long after you have finished reading the book." - Linnea Tanner, author of the Curse of Clansmen and Kings series.

"A truly well-written book which has the reader gripped and yearning for more." - Stacy Townend, author of The Mercian Tales.

"Full of rousing battles and journeys over land and sea, Riddle of the Gods sees the protagonists strained and broken in ways not encountered in the earlier volumes." - Rowdy Geirsson, author of The Scandinavian Aggressors