For journalist Karen Owen, the circumstances surrounding her great-grandmother's death have always been a bit of a mystery.
Frida Williams was found dead in her home at on the morning of 10 December 1949. Although a natural death was recorded by the doctor at the time, the pieces making up this complex jigsaw don't all fall into place.
The programme follows Karen's emotional journey as she tries to piece together Frida's last movements and the events surrounding her death.
Karen has heard many a time how Frida's body was found by her son Adrian (Karen's grandfather) on that Sunday morning.
During the programme Karen goes to 24 Stryd Menai for the first time and sees the bedroom where Frida took her last breath.
When she pays a visit to her grave, Karen's doubts regarding the mystery surrounding Frida's death are intensified by the plain headstone which sits among the decorative stones of the time.
What will Karen's research reveal, and is she any closer to finding out what happened?
© 2010 S4C
O Gymru / Made in Wales