Dexter Season 5

A non-killer identity was the only detail offered for Stiles' role at this time. Showtime's official description doesn't add much more to the mystery character other than she's "a mysterious young woman who forms a unique relationship with Dexter." Let your mind run wild with that one.

Julia O'Hara Stiles (born March 28, 1981) is an American stage and film actress. After beginning her career in small parts in a New York City theatre troupe, she has moved on to leading roles in plays by writers as diverse as William Shakespeare and David Mamet. Her film career has included both commercial and critical successes, ranging from teen romantic comedies such as 10 Things I Hate About You (1999) to dark art house pictures such as The Business of Strangers (2001).