It Wasn't Always Like This — Joy Preble

In 1916, Emma O'Neill is frozen in time. After sampling an experimental polio vaccine brewed on a remote island off St. Augustine, Florida, she and her family stop aging -- as do the Ryans, her family's business partners. In a way, this suits Emma fine because she's in love with Charlie Ryan. Being seventeen forever with him is a dream. But soon a group of religious fanatics, the Church of Light, takes note. Drinking the elixir has made the O'Neills and Ryans impervious to aging, but not to murder -- Emma and Charlie are the only ones who escape with their lives.

On the run, Emma is tragically separated from Charlie. For the next hundred years, she plays a cat-and-mouse game with the founding members of the Church of Light and their descendants. Over the years, a series of murders -- whose victims all bear more than a passing resemblance to her -- indicate that her enemies are closing in. Yet as the danger grows, so does Emma's hope for finding the boy she's certain is still out there...