Kit Owens thought that she would never see Diane Fleming again. The pair were best friends in high school, until a confidence shared between them changed everything. Kit thinks she has moved on with her life, fulfilling the scientific dreams that Diane awakened within her. The dreams that Diane wanted for herself. But Kit thought wrong. When Diane shows up unannounced in Kit's lab one day, formidable competition for the fellowship that would make Kit's career, the past comes roaring back to life. And when the deadly secret that drove them apart threatens their lives in shocking, unexpected ways, Kit has to make a choice and decide whether extending a hand to her former friend will save her, or ruin them both.