Octogenarian musician Lena Gaunt lives quietly in the Perth suburbs. An early embracer of electronic music, she found fame in Jazz-age Sydney as a virtuoso of the theremin and travelled the world before settling down to a life of daily swims... and a decades-old heroin habit.Now, for the first time in 20 years, she's performing at a festival again. In the audience is documentary filmmaker Mo Patterson. Lena's extraordinary past makes her an intriguing film subject: but is she prepared to reveal the secrets she has guarded for so long?Spanning continents and much of the twentieth century, from colonial Malacca to post-war Europe, this is a story of talent, modernity and belonging, of a woman shaped by the ebb and flow of love and loss, and the constant pull of the sea.