Sweetpea 's protagonist Rhiannon Lewis (played by Ella Purnell) is the definition of an anti-hero – and that's still something so rarely seen when it comes to female characters on screen. A female-driven "coming-of-rage" story, Sky's new series sees a former wallflower pushed over the edge, unleashing a killer secret.

Part of what has made actor Ella Purnell such an entertaining performer is how, no matter how complex and layered her characters might be, she injects them with charm and delight that allow audiences to empathize with them.