This image is the cover for the book King and Emperor, The Hammer and the Cross

King and Emperor, The Hammer and the Cross

Driven by prophetic dreams, the Viking warrior Shef as become the One King, the undisputed ruler of the North. Now he must face the reborn power of the Holy Roman Empire.

Rome threatens Shef's fearsome Viking navy with a new invention of unparalleled destruction: Greek fire. Unable to defend his fleet against this awesome weapon, Shef travels East in search of new wisdom. His quest leads him to the lavish court of the Muslim Caliph and, ultimately, to the secret hiding place of the Holy Grail.

Harry Harrison

Harry Harrison (1925–2012) began writing science fiction in the 1950s and remains one of the top-selling authors in the genre. Harrison is best known for his Stainless Steel Rat, Deathworld, and West of End series, as well as Make Room! Make Room!, which was turned into the movie Soylent Green starring Charlton Heston and Edward G. Robinson. His novels have appeared on the New York Times bestseller list, and in 2009 he was awarded the Damon Knight SF Grand Master Award by the Science Fiction Writers of America.