Dr. Antoinette Day—a young, successful pathologist known to her friends and colleagues as Toni—has no idea what awaits her when Dr. Sally Shore arrives at Perrine Memorial Hospital in Twin Falls, Idaho, to fill in for a colleague recovering from a heart attack. Toni's life is about to become a living hell.

Dr. Shore is supposed to see patients, perform surgeries, and take turns covering the emergency room until the regular surgeon recovers from his quadruple bypass. But unfortunately, she uses her temporary opportunity to discredit Toni and tarnish her reputation with her medical colleagues. When the visiting surgeon is conveniently murdered—her lifeless body found in Toni's office—Toni is the obvious suspect. But Toni is not going down without a fight. Forced to solve the murder in order to save her future, Toni's life becomes even more complicated when her ex-boyfriend starts stalking her and threatening her husband.

In this riveting murder mystery, a stubborn pathologist must rely on more than just her microscope as she delves into a complicated web of deception, soon discovering that it is not just her freedom at stake—but her life.