The Promises She Keeps by Erin Healy

Promise is dying. Suffering from cystic fibrosis, and having multiple peers surrender to the disease, she knows her time on this earth is limited. But she doesn't want to be a tumbleweed in the wind, no she wants to be remembered and loved and she will accomplish that with her incredible voice.

When Promise survives multiple should-be-dead situations, an aging pagan witch named Porta believes she may have finally found the goddess of immortality. What's more is Zack, who Promise hardly knows, was present at each close-call situation.

Then there's Chase. An autistic artist with a love for trees, he has a revelation and has gone either completely insane, or might be on to something.

The first book I've read by solely Erin Healy. Her writing style is very similar to Ted Dekker's, only much more descriptive in a way that fuels your mind's eye without going overboard. I love how there is a sorceress in the novel; it just makes everything more... interesting. Though she's not quite what you expect. Very suspenseful, but not really dark. The ending has a fabulous twist that I never expected. Amazing book, almost impossible to set down. Erin, this is a work of perfection.