Atlantis

Atlantis summary:

Heart of the Dragon (Atlantis #1) Grace Carlyle 's world was about to change . . . Deep in the jungle on the trail of her missing brother, Grace never expected to find a secret world populated by mythological monsters -- nor guarded by a sword-wielding being whose beauty put mortal men to shame. Darius en Kragin belongs to a race of shape-shifting warriors sworn to guard Atlantis and kill all travelers who stray within its boundaries. Yet when Grace stumbles into his realm, he finds himself tempted to betray his centuries-old vow. Now their forbidden love will either bring their worlds together -- or tear them both apart.