A Reno singer witnesses a mob murder and the cops stash her in a nunnery to protect her from the mob's hitmen. The mother superior does not trust her, and takes steps to limit her influence on the other nuns. Eventually the singer rescues the failing choir and begins helping with community projects, which gets her an interview on TV—and identification by the mob.
Sister Act - watch online: streaming, buy or rent
Currently you are able to watch "Sister Act" streaming on Hotstar. It is also possible to buy "Sister Act" on Apple iTunes as download or rent it on Apple iTunes online.