A Spell of Empire: The Horns of Tartarus
In the north, the Nibelung Empire covering Scandinavia and Northern Europe. In the south, the Tyrrhennian Empire, decadent child of once mighty Rome. In between, Volker Seefried, musician and sorceror's apprentice, finds himself in danger of being crushed to dust.
Having left the city of Worms hurriedly when his master's final conjuration resulted in a congealed magician, Volker finds himself in Nurnberg. He is offered work by a rich merchant who asks him to recruit three bravos to accompany them on a perilous journey. And thus - not without some minor disasters - is formed a group of modern musketeers whose motto might be "All For One and Each For Himself!"
Michael Scott Rohan
Michael Scott Rohan (1951-2018) was a Scottish fantasy and science fiction author and writer on opera.
He had a number of short stories published before his first books, the science fiction novel Run to the Stars and the non-fiction First Byte. He then collaborated with Allan J. Scott on the nonfiction The Hammer and The Cross (an account of Christianity arriving in Viking lands, not to be confused with Harry Harrison's similarly themed novel trilogy of the same name) and the fantasy novels The Ice King and A Spell of Empire.