As DI Jimmy Perez pieces together the final moments of Lizzie Kilmuir and Sally McColl’s lives, there’s a far-reaching sadness that comes with the truth.

The personal and professional collide when Perez links Duncan Hunter to Sally and Lizzie, and must tell stepdaughter Cassie that her father may be a double murderer.

Shetland – more than a whodunit…

Please note this programme airs at 10.40pm in Wales.