"The Suicide Tree" by Shayla Raquel.
The characters are full and interesting. I felt that they had a past and future—not just the incidences I was reading about in the book. The author created a near-future time frame (which is so much more interesting than a far-distant future), a fatal disease, two ways of infecting a person with mental illness, and never got too complex for me. The heroes are flawed and the villains are not all bad—making them so much more believable. I appreciated the contrast between the high-tech world of computers and the old-world charm/traditions of ancient towns and cities.
Thank you, Shayla.