Indica Elizabeth Watson was born in London, England. Her father is a musician and her mother is a doctor. She is a member of a children's choir and plays the violin. Her acting debut came in 2015 in a short film by Chris Blaine and Ben Blaine called Who Are You?. Her debut television appearance was in the second series (2016) of The Missing (2014). In 2017 she played the young Eurus Holmes opposite Benedict Cumberbatch in the series 4 finale of Sherlock (2010).