The glass harmonica is a rare musical instrument invented by Benjamin Franklin in 1761. He fell into oblivion after his disturbing sound and his musicians were accused of strange events, including illness, madness and death. Gerhard Finkenbeiner, a German scientific glassmaker resident in New England, relaunched the production of the instrument in 1984. Fifteen years later, it mysteriously disappeared. Neither his instrument nor his body was ever found. The Singing Glass brings together archival and staged footage with present-day accounts by three women whose diverging hypotheses regarding the man’s disappearance throw us head down into a swirling world of sounds and visions, wherein the glass harmonica acts as main rotation axis.