I've only seen her in BBC's crime drama Luther so far, but her acting in that is superb.
The chemistry she shares with Idris Elba is captivating and the tension they create together makes the show what it is. Without her powerful acting the show would suffer, in my opinion. The men will probably like that she's beautiful too.
She gives her murderer character so many believable dimensions that I can only imagine what she would be like in other programmes/films. Any show she's in from now on I'll certainly be keeping an eye out for. Does anyone have any recommendations?