Antigoddess

Antigoddess by Kendare Blake, 336 pages

The story is told from the point of view of two different groups of people.  One group is led by Athena.  She and her brother Hermes are trying to figure out how to stop dying.  Even though they are immortal, fate can still kill them.  And apparently, so can some of the other gods goddesses, like Hera, who is trying very hard to do just that.  The other group focuses on Cassandra.  She appears to be mostly a normal girl.  Except, she can always predict which side will land up on a coin toss.  And she has visions of the future that always seem to come to true.  And several of the gods and goddesses are looking for her.