To bolster Agency funds, the Official comes up with a plan where he, the Keeper, and Hobbes will go to one of Arnaud's casinos and, using Darian's invisibility powers, break the bank. The first part of the plan goes well, but Darian decides to steal the remaining $7 million of the casino's money on his own. When confronted by the Official, Darian denies the theft. In response, the Official cuts off his supply of the counteragent. Arnaud contacts Darien and offers him the counteragent in return for the money. Stalemated with the Official, and with quicksilver madness coming on, Darien is tempted, but Arnaud mysteriously disappears. Darien talks with Arnaud's imprisoned brother Huiclov, who refers him to a doctor that Arnaud was visiting. darien goes to the hospital to the doctor, already red-eyed with madness. The Official has sanctioned an outsider to bring in Darien, taking an unhappy Hobbes off the case. Hobbes tracks Darien to the hospital on his own, and manages to find him with a

Presumably the audience voted yes to Hobbes' decision to join Fawkes. Darien, in end-stage Quicksilver Madness, is now obsessed with finding Arnaud. Hobbes sticks close by trying to keep him from killing random bystanders. They catch up to Arnaud, but Hobbes helps him escape when it appears that the maddened Darien will kill him. Darien abandons Hobbes, who is then approached by Arnaud. Arnaud has a malfunctioning Quicksilver gland of his own, and needs to use Darien's as a baseline to get his own fixed. In return, he'll give Hobbes Stage Five Counteragent to reverse Darien's advanced condition. Hobbes helps capture Darien, and a surgeon, Dr. Reynolds, manages to adjust Arnaud's gland. Darien gets the Counteragent, but before it can take effect he tries to kill Arnaud. Arnaud escapes during the distraction when the counteragent kicks in. Later, Arnaud goes to visit Reynolds when he realizes that the surgery did not go quite right, and he is permanently invisible.