Keira Knightley will join Colin Farrell for a stroll.

Knightley and Farrell have signed on to the crime thriller "London Boulevard," according to The Hollywood Reporter. Ken Bruen's source novel, due in stores this November, follows small-time crook Mitchell, an ex-con who finds work in the mansion of has-been actress Lillian Palmer. As you might guess, circumstances force Mitchell to return to his less-than-legal ways.

Farrell will play Mitchell, with Knightley in the Palmer role.

Filming begins this week in, of course, London.