The remains of Marian Partington’s sister, Lucy, were found in the cellar of Fred and Rosemary West’s house 25 years ago.
She had been missing for more than 20 years.
Marian, from Llanidloes, has spent her life reflecting and coming to terms with what happened.
Now, she explains how, even after the horror of what her sister endured at the hands of the Wests, she found herself able to forgive them for what they did.
Watch BBC Inside Out West, on BBC One, at 7:30pm on Monday.