Stolen By Shadows by Elizabeth Helen

Once upon a time, I used to look upon the sun. Now, there is only darkness.
And the Prince of Thorns.
I am his captive, his thrall. Caspian, the man he used to be, is nothing but a memory. And if the Prince of Thorns gets his way, all of the Enchanted Vale―and the four other princes bound to my heart―will fall to ruin.
As I navigate the treacherous Below, my mates risk everything to reach me. But the Green Flame is spreading across the realms, corrupting all it touches. If they can’t fight it, Caspian won’t be the only one consumed by its power.
It’s now or never. Either we defeat the god who seeks to tear our world apart…or we die together, becoming nothing but shadow.
But I’ve learned something down here. Beautiful things can grow in the dark. I’ll do whatever it takes to protect my home and family…and bring Caspian back to me.