Fresh off her breakout performance in Leave No Trace, Thomasin Harcourt McKenzie has signed on to join Anya Taylor-Joy in Edgar Wright's psychological thriller Last Night in Soho, which has also added Doctor Who alum Matt Smith, Collider has learned. Wright came up with the original story and co-wrote the screenplay with Krysty Wilson-Cairns (Penny Dreadful), though plot details are being kept under wraps for now. All we know is that the story is set in London's Soho district, and that's where filming will take place this summer. The film will be a co-…