Missy was born in London and grew up there. When she was 14, she became a member of the National Youth Theatre Group, with whom she participated in a number of productions. . In 2013, she played Beatrice in Shakespeare's 'Much Ado About Nothing' at the Chelsea Theatre as well as the part of the Younger Lady in Brecht's 'Caucasian Chalk Circle'. She began acting for film when she starred in the short film 'Mirror Mirror', and subsequently starred in the short films 'In the Garden' and 'Thief'. In 2014 she played the lead role of Myra in the play 'Deathtrap' at the Burton Taylor Studio. She made her feature film debut in Reg Traviss' 'Anti-Social' and will appear in 'Now You See Me: The Second Act' alongside Morgan Freeman, Michael Caine, Woody Harrelson, Isla Fischer and Dave Franco