The Empty Altars series: The Greek goddess, Diana, is annoyed when her runes send her to the Norse lands to help the gods there. She's more annoyed to learn that Tyr and Donar don't want her help and tell her to go home, but the goddess Freya, with her seidre magic, knows they're wrong. Without Diana's help, Tyr and Donar might lose their next battle.
The Empty Altars series in order:
Book 1: Empty Altars
the free short story on this webpage: Dark of the Moon
the free interview with Tyr
the free interview with Diana
Book 2: Spinners of Misfortune
the free, 5 part story on this webpage: Freya's Story
The Emerald Hills series:
Fabric of Life is a standalone novel, but the novella collection, Emerald Hills, uses the same setting and some of the same characters that are in the novel.