After an operation goes bad and Fawkes goes into Quicksilver Madness, Darien realizes that there may be a way to find a cure. Despite the Official's orders not to, he has the Keeper inject him with some of his brother Kevin's DNA and channel his personality and memories as he did with Simon Cole (in "The Other Invisible Man"). The operation succeeds, but the DNA dates back to four months before Kevin and Arnaud DeFehrn mutated the gland. Hobbes and "Kevin" track down Dr. Elizabeth Rindell, who put the second gland in DeFehrn. DeFehrn beats them up and manages to escape, but "Kevin" is later kidnapped. "Kevin" fakes a fit of madness, knowing that the Counteragent will bring Darien back. Arnaud escapes again, but they get hold of a laptop computer with files on the gland. However, when they bring "Kevin" back for the last time to decipher the files, he refuses, believing Darien is a better person for it. Darien, needless to say, is less than thrilled.