The Illumination

Natalie Landau, a museum curator with expertise in Mesopotamian protective amulets and magical beliefs, has received a puzzling gift from her sister Dana - a necklace with a blue evil eye pendant on it. The Evil Eye is a symbol of protection common throughout the world, with a history connecting it to many religions.
When Dana is murdered, Natalie begins to think her evil eye amulet had something to do with her sister's death. As she races to discover the origin of the pendant, Natalie is sucked into an international battle between powerful religious factions, each battling for the eye, which turns out to be far more valuable - and far more powerful - than she could ever imagine.