«Ring of Truth» by Nancy Pickard

Sex, violence, evil, and betrayal – the shocking murder case splashed across the Florida headlines has all the right elements for true-crime writer Marie Lightfoot's next bestseller. And tell the tale she does, in a book that reveals the secrets of a love affair gone fatally wrong. But there are disturbing twists, which leave Marie sensing in her gut that something does not jibe.
Twist number one: the accused is a man of the cloth, who has allegedly killed his wife in collusion with his lover. Twist number two: a pair of young girls find the body in an abandoned mansion, adding the death of innocence to the magnitude of the crime. Twist number three: a shattering conviction turns the case on its ear. And the ultimate blow: for the first time in her career, Marie fails to win the the killer's confidence during a jailhouse interview. Suddenly, she knows with certainty there ia more to the story than even she realized – and her conscience won't let her rest.
Then an unexpected visitor – a shock in itself for the reclusive writer – confesses something that not even the police know. The revelation may he the missing piece in a terrifying puzzle – evidence that teaches Marie a bone-chilling lesson as threatening danger slowly encircles her: to err is human, but underestimating the criminal mind can be deadly.
Nancy Pickard premiered gutsy Marie Lightfoot in the national bestseller The Whole Truth, and kicked off a thrilling new series with "an intriguing story, fascinatingly told" (The Philadelphia Inquirer). Now, Pickard once again "pushes the presumed limits of [crime fiction]" (Los Angeles Times) as she sends this complex heroine into a jagged maze with one destination: the darkest realm of human nature.