The Butler, On the Run is Chapter 146 of the Kuroshitsuji manga.
Having arrived in London, Sebastian tells Baldroy to head to the Funtom Corporation headquarters as he believes that "Ciel"'s influence should not reach it as Ciel built the company on his own. However, when they go there, the place is watched by multiple Scotland Yard officers.
Then, Sebastian suggests hiding abroad. Before doing so, however, they should find another place to rest first. While they are talking, a Scotland Yard officer spots them and wants to know what they are doing. Promptly, they run away; Sebastian leads them to the Lark Photographic Studio. They go inside, and when the officers run past the shop, they sigh in relief. Shortly afterward, Pitt surprises them by taking a photo of them. He jokes that he will sell it as it will bring in a "tidy sum." Then, Pitt introduces himself again; this time, as the owner of the Lark Photographic Studio.
Pitt asks what kind of photo they would like today, and Sebastian says a tableau vivant with "The Legend of King Arthur" as the theme. Then, Pitt guides them to the shop's back area and to a pathway which leads to the underground sewage network. Before they part ways again, Pitt gives them a map, masks, and a lantern and promises that he will try to contact Chlaus and Diedrich for them.
Pitt goes back upstairs—only to find Arthur Randall and some officers in his studio. At gunpoint, Randall asks him where Ciel and the others are, and Pitt tells him that they are escaping through the sewer system.
Before Randall and the officers can catch up with Ciel and the rest, the ceiling falls down, cutting off the way for the Scotland Yard members. And on Ciel's side of the damaged path, they are joined by Lau and Ran-Mao.