Fresh evidence is presented surrounding a clandestine meeting months before Renee and Andrew disappeared. There is an offer of money for a job that needs doing.

We hear from the accused, 80 year old William MacDowell, about his illicit affair with Renee and how he regularly treated her.

Five days after Renee and her son Andrew vanish, the accused makes a most unusual and urgent request for his company car which he is forced to return having being sacked.

For 46 years Rosemary MacDowell has stood firmly by the accused, her husband. Today she takes the stand giving her version of the night when her husband's lover disappeared.

We hear from the person who holds the key to unlocking this decades long mystery, Valerie Steventon. She was Renee’s closest friend and confidante who knew all her inner secrets.

Renee’s sister gives evidence. On a quest to find what happened to her only sibling, she details her desperate actions after Renee’s secret is revealed by her closest friend.

Today two men see each other for the first time in 46 years. One man's wife and her child are gone. The other man, who was her lover, is accused of killing them.

Renee's BMW is found ablaze in a layby one November night in 1976. She and her young son are never seen again. That same evening, a local resident hears ‘a blood curdling scream’.

Mother and son Renee and Andrew MacRae vanished in the Scottish Highlands in 1976. 46 years on, an 80-year-old man stands accused of their murder. Will justice finally be served?