Hannah Eakin, right, rehearses for the role of Julia in playwright and composer Sam Balzac’s adaptation of Robert Louis Stevenson’s black comedy novel “The Wrong Box” on Tuesday while Music Director Fernanda Douglas plays the piano. Next to Eakin is Molly Rose Heller, who plays Gideon. The musical will be debuted for one night only this Saturday at the Saranac Lake Free Library at 7 p.m. The performance is free to the public. (Enterprise photo — Aaron Marbone)