Billy Staton and his fiancée, Leticia Castro, vanish without a trace; then, the discovery of Billy's burnt-out car and a shocking confession reveal a web of lies which can only be shredded by a secret recording.
Robin Sowders is brutally beaten in his home in Bloomington, Ind., and later dies from his injuries; when his wife turns up at the police station, the investigation gets turned on its head; only a wiretap reveals the truth.
Investigators must cast a wide net for clues after Sharon Garrison's family reports her missing; there's evidence to suggest she has skipped town, but secret cassette tapes soon point to something far more sinister.
Dr. Margo Prade is shot to death in the parking lot of her medical practice in Akron, Ohio, and the senseless act shocks the city; police are baffled until they discover that Margo's phone calls were being secretly recorded.
In Nanuet, N.Y., Michelle Despinasse is shot inside her home and succumbs to her injuries after being rushed to the hospital; investigators discover that Michelle made a secret recording in her final moments that reveals her killer's identity.
Grandfather Jack Rains, 83, is murdered in his home in Murfreesboro, Tenn.; when rumors emerge of an affair between the victim and a women half his age, police start to investigate his close friends.
Elderly couple Roy and Angie Woodley are found brutally stabbed to death in their Fresno, Calif., home; believing the crime to be a robbery-gone-wrong, detectives soon realize the perpetrator may in fact be a family member with a grudge.
While searching for Tami Reay, detectives find blood in her car and arrest her husband, Brad; then, they receive a tip pointing at an entirely different suspect.
After Joe Morrissey is brutally killed in an apparent home invasion, detectives come to believe that the attack was personal and focus on Joe's wife, Kay.
Melissa Atkins is found bound and murdered in her home in Smyrna, Tenn.; the investigation zeroes in on two individuals and involves a series of recorded phone calls exonerating one of them, whilst incriminating the other.