Lestrade strides into the office at the Yard, leaving the door open behind him. Anderson and Donovan look up, and Anderson goes to shut the door, before he was stopped. "Come on, Ben!" he calls impatiently. "Hurry up!"
The other agents stare in surprise as a little boy shuffles into the room, his eyes glued firmly on a small handheld game. Lestrade takes him proudly by the shoulders. "This is my son, Ben." Sally and Anderson look at each other, then back at the Lestrades in wonder.
Ben stays at the office the whole day. When Donovan plucks up the courage to ask Greg why Ben is here with them, he simply replies, "Couldn't get a nanny." She tentatively asks about the boy's mother, to which Greg snorts and turns away. She and Anderson shrug at each other behind his back.
Over the course of the day, it is evident that Greg is fond of his boy. He sends him out of the room when a gruesome murder case is being discussed, and he always makes sure the kid has enough water and is warm enough.
At the end of the day, they leave the office and Anderson turns out the light. He turns and bumps into a cabinet. "Oh…" he starts to say, when Donovan coughs and nods at Ben. "…bother."