After Sherlock's first exultant shout that he was "in" the computer there was nothing but the rapid clicking of the keyboard accompanied by the occasional rasp of a page turning, and John allowed the sound to sink into the background as he tried to work out their best way forward.
He trusted Sherlock to solve the puzzle of the Scotland Yard mole, and from there they could hand that piece of work over to Mycroft.
The loss of Lestrade was a blow to their cause, not just because finding him had to be high on their priority list, but also, and slightly selfishly, John needed to know what was going on with the bombs.
He had just made a mental list of calls he needed to make when his companion suddenly spoke.
"Now we have you!"
"Who?"
"Detective Inspector Dimmock!" Sherlock's voice was harsh.
"That name mean something to you?"
Sherlock nodded, and was surprised when there was no further comment. Then he felt a hand, soft against his face, reminding him of their first meeting.
"Talk to me." John kept his hand against Sherlock's cheek as he knelt beside him.
"Dimmock, he was on the Prime Minister's Diplomatic Protection Squad when the government fell."
"And he got away? Send this over to your brother, it's more his line of business."