The Empyrean Key

Paris is under attack.

Mysterious strikes around the city keep leaving landmarks destroyed, and no one knows why or by whom -- though it is believed to be caused by a shape shifter.

When Kale, a clueless American tourist, inadvertently gets marked by an otherworldly crystal at one of the ruins, a secret, magical society steps in to try to save him, including the enigmatic nymph, Lily.