Shadow Rider - Gina L. Dartt

The world of the Five Nations is ruled by Elementals, those chosen few capable of controlling earth, air, fire, and water, but it is the Paths of the Shadow Realm that link the nations, navigated by the mysterious Shadow Riders.

Courier Shay Kendrith carries precious goods and crucial documents for the Crown, a solitary and dangerous life that takes her from one end of the world to the other. The last thing she ever expected to discover while traveling the Realm is an Elemental fighting for her life against the deadly wraiths inhabiting the Shadows.

As an Undine, Marshal Keagan Riley wields water, using her abilities to protect and serve the Crown. Being drawn into the Shadow Realm with Shay begins a harrowing journey that will lead them to the Elemental Stones, previously lost to history, but uncovered by unknown forces that may destroy everything they've sworn to protect.

In the Shadows, one can easily find death, but can Shay and Keagan find love as they fight to save the Five Nations?