After receiving news connected to the investigation, Elizabeth decides to question Jamie Usher at her flat and asks Bogdan to join her in case Jamie proves dangerous. Elizabeth believes many existing suspects do not fit, and she hopes that understanding why Holly Lewis called Jamie’s number shortly before dying will unlock both the murder and the missing money.

When Jamie arrives, Elizabeth and Bogdan pressure him immediately. Jamie notices that Elizabeth is not really a family-history researcher and says the police have already visited his house. Under questioning, Jamie admits to mortgage fraud and other minor cons, explaining that this is why he assumed the police were after him, but he seems genuinely shocked when Elizabeth accuses him of being linked to Holly Lewis and the car bomb.

Elizabeth and Bogdan intensify the intimidation, and Jamie continues to deny ever knowing Holly or speaking to her. Elizabeth shows him the number Holly called on the night she died, and Jamie confirms that it is his number. Even so, his panic and confusion persuade Elizabeth that he is not lying: Jamie is a criminal, but not the sort involved in murder or bomb-making.

Elizabeth then shifts her attention to Jamie’s wife, Jill. She asks whether Jill might have secrets of her own, why they moved to Manchester, and whether Jill ever mentioned Holly Lewis, but Jamie insists Jill has no criminal history and would have no connection to Holly. Bogdan casually suggests that Holly may simply have dialed a wrong number.

That suggestion triggers Elizabeth’s breakthrough. Instead of accepting the call as a mistake or a direct attempt to reach Jamie, Elizabeth suddenly realizes that Holly’s final call may itself have been meaningful as a code, and she concludes that she now understands Holly’s code.