For a time, Dr Jekyll seems transformed, emerging into society with renewed purpose and warmth. Then, without warning, he retreats once more behind locked doors. Their mutual friend Lanyon has discovered a terrifying truth that he refuses to share, but a letter sent after his death draws Utterson toward a dreadful possibility. What is happening inside Jekyll's laboratory?

Set in the foggy, cobblestone streets of London, lawyer, John Gabriel Utterson investigates the mysterious relationship between his old friend, Dr. Henry Jekyll, and a sinister man named Edward Hyde. What begins as a troubling mystery surrounding a suspicious will, quickly spirals into a dark exploration of science, morality, and the duality of man. 

The Haunted Library is open. Come in. Stay awhile.

Narrated by Colin Morgan

Written by Robert Louis Stevenson

Sound design by Jon Nicholls

Produced by Lydia Shamah for BBC Studios

Associate Producer: Lorna Newman for BBC Studios

Recording Engineer: Laurence Pearson for ID Audio