The first book in this wonderful saga starts with The Crown Prince. If you are looking for a subversive fantasy series, then look no further.

The enemy of the gods finds his life threatened by a prophecy and makes a terrifying plan to save his own life. Skuld who can see the future has a disturbing vision, she insists that the royal family in Midgard is in grave danger. The Allfather immediately sends out his battle Valkyries to find and eliminate the threat.