A Sunday school teacher named Miriam Illes is shot sniper-style through her kitchen window in Williamsport, Pennsylvania. Convoluted evidence and anonymous handwritten letters throw them off the scent, but the killer is right under detectives' noses.

A pretty, young mother is shot dead in her bedroom in 1985, and her teenage stepdaughter confesses to the crime. The case is as good as closed, but detectives suspect there's more to this twisted family than meets the eye, and they're right.

Vietnamese-American Thien Minh Ly is found stabbed on tennis courts in Orange County, CA. There is almost no evidence and the case runs cold until detectives catch wind of a letter revealing the shocking truth.

Jarrod Davidson is shot dead outside his apartment in Santa Barbara, California, and next to him is a suspicious potted plant. He was in the middle of a nasty custody dispute, but the DNA doesn't match his ex-wife.

In 1994, 55-year-old millionaire Bill McLaughlin is shot dead in his mansion in Newport Beach, CA. The emotional killing and keys found in the door indicate a killer in his close circle, but it takes 15 years to get to the bottom of the twisted case.

A 31-year-old woman named Julie Keown dies of antifreeze poisoning in Waltham, Massachusetts. Detectives rule out suicide and accidental ingestion. Then, after untangling a web of lies, they turn to her husband, James, a popular radio host.