Grace Dent follows Untold listener Shirley as she tries to find out the exact circumstances of her estranged son's death from drinks and drugs.

Shirley had just arrived at work when she got a phone call which changed her life - the student finance company wanted her son's death certificate for their records. Six months previously Ben, who was sleeping rough, had disappeared - but Shirley had no idea he'd died.

Shirley needs to know more about her son's death. Three years on, she hopes to meet the rough sleeper who was with him when he died - and visit the drop-in centre which tried to help him.

Producer: Sara Parker.