Information for Longitude - A Clockmaker's Obsession at Upstairs at the Gatehouse, Inner London (Musical). Come with us on an epic voyage across time and space to share the trials of a simple clockmaker who lost almost everything in his quest to save others. A true story of betrayal, obsession, and injustice, conquered only by the love of his family and the intervention of Mad King George. World premiere of a new musical with crashing waves, swelling music, and an emotional storm across the 18th century that will make you wish you'd brought your life jacket.