After giving Archer's hand a firm shake, he moved behind Archer. Improvisation didn't particularly appeal to him - he liked having a plan - but he did well enough with it. A couple of scenarios were run through his mind as he waited for Isobel to come to the door, each ending more disastrously then the first. Fuck, he shouldn't have agreed to this.
The girl finally opened the door and Luther's eyes scanned her. Ill-kept, tired, and definitely underweight. Girls these days tended to keep themselves at an unhealthy size though - he couldn't know what she had started at. At her sharp tone, Luther tilted his head, giving a slight smile. All politeness. "Inspector Luther. Can we come in?"