Worldshaper

From an Aurora Award-winning author comes the first book in a new fantasy series in which one woman's powers open the way to a labyrinth of new dimensions.
For Shawna Keys, the world is almost perfect. She's just opened a pottery studio in a beautiful city. She's in love with a wonderful man. She has good friends.
But one shattering moment of violence changes everything. Mysterious attackers kill her best friend. They're about to kill Shawna. She can't believe it's happening—and just like that, it isn't. It hasn't. No one else remembers the attack, or her friend. To everyone else, Shawna's friend never existed...
Everyone, that is, except the mysterious stranger who shows up in Shawna's shop. He claims her world has been perfect because she Shaped it to be perfect; that it is only one of uncounted Shaped worlds in a great Labyrinth; and that all those worlds are under threat from the Adversary who has now invaded hers. She cannot save her world, he says, but...