Michelle McNamara reflects on the 1984 murder of her childhood neighbour Kathy Lombardo, which she credits with planting the seed for her lifelong fascination with unsolved crimes. Michelle really wanted this child and wished to get her murderer caught. The story of the victims has to be told.

The archaeological world is fooled for nearly half a century when an ape-like skull that's claimed as solid evidence for Darwin's theory of human evolution is proven fake. Using new research, experts investigate and uncover the identity of the forger.
Locked away in a store room at London Science Museum is a genuine 19th century miracle machine, a 180-year-old mechanical engine that solves complex mathematical equations, more than 100 years before the first electronic computer.

The jeweled-encrusted pectoral of King Tut is a hieroglyphic artefact of stunning craftsmanship and one of the greatest treasures of the pharaohs. Was this ancient glass scarab in Tutankhamun's tomb created by forces from beyond our world? Using new research and the latest tech, experts confront the ancient mystery of its flawless glass scarab.
Is a 4,000 year old clay tablet the original instruction manual for Noah's ark? And how can a bizarre red moon rock contain signs of life?

Michelle McNamara and her editors agree to push her book deadline after being granted access to the Orange County Sheriff's Department's East Area Rapist / Original Night Stalker room. After everybody realized the killer moved south, that story exploded. The hope was that by having greater public attention, the right person gave the right tip.

An unassuming 80-year-old device that has the appearance of a typewriter could actually be one of the greatest secret weapons in history. Using cutting-edge digital technology, experts investigate the secrets of a revolutionary encryption machine.
How could there be a carving of a modern helicopter on an ancient Egyptian inscription? can this 800-year-old device covered in strange sayings really predict the future?

Edgar Davidson agrees to talk to investigators but tells a different story. Cathy’s sister Marilyn indicates her interest in solving the case. Tom Nugent casts doubt on Gerry Koob’s story about the night of Cathy’s disappearance. The search for the other man at Cathy’s apartment Pete McKeon may have information about Koob’s relationship.
What Cathy’s roommate Sister Russell knew about the abuse and Cathy’s relationship comes into question. 'Jane Doe' and 'Jane Roe' meet for the first time and talk about the Keough. Abbie investigates Baltimore’s investigation into the abuse reports they received. Marilyn Cesnik Radakovic recalls receiving a mysterious letter from her sister after her death.