Ella Purnell, the Brit star best known for lead roles in "Fallout," "Sweetpea" and "Yellowjackets," is joining Nicholas Galitzine in upcoming feature "The Return of Stanley Atwell." The film, described as as seductive thriller, comes from Hera Pictures, the Oscar-nominated and BAFTA and Golden Globe-winning production company behind "Hamnet," and co-produced with John Gore Studios. [...]