Devastated by the death of his twin brother, Marcus comes to stay with his aunt at her cottage in the rolling English countryside. Here he meets the extraordinary five brothers who are George, Jack, Peter, Michael and Nico. Here, also, is the small, coughing, pipe-smoking Scotsman that Marcus firsts learns to call Mr Barrie and then Uncle Jim. Long forgotten events come to life as the Past blends with the Future to make the Present. But who are the ghosts? Is it Uncle Jim, George and his brothers or is Marcus himself the ghost? Marcus learns that he is not the first person to come to the to the Cotswold countryside to be healed of a terrible loss. I Believe in Peter Pan reveals the magical world of J.M Barrie and the Llewelyn Davies brothers and brings them back to life again - if only for a short time.