Katrice Lee: A Father's Story
Two-year-old Katrice Lee vanished near a British Army base in Germany in 1981.
Her father, Richard Lee, has spent four decades trying to find out what happened to his little girl.
As part of a BBC Sounds series, launched on International Missing Children's Day, Mr Lee - from Hartlepool - describes how he has coped with being in the headlines while trying to get help from the authorities, both in the UK and Germany.
In recording Katrice Lee: A Father's Story, he describes how he "bared his soul" in the hope it might help his family find some answers.
- Listen to the BBC Sounds series here