Redeemed in Darkness by Alexis Morgan
While investigating the theft of the rare blue gems that provide light and energy in Lusahn q'Arc's world, the courageous Other female leader battles a Paladin warrior who haunts her thoughts and dreams long after their battle. When the Paladin, Cullen Finley, crosses over to her world in lieu of Barak, her long-lost brother, the relationship between Lusahn and Cullen becomes complicated. Together, these beings from different worlds fight to keep their steamy romance a secret - and to keep one another alive.