Claudia sensed something was possessing Artie, so she used the same dagger that split the orchid from its housing to split the evil from Artie's heart. Claudia's instincts were eerily Mrs. Frederic-esque, but even after they remove the dagger (with no damage, by the way), Artie remains unconscious.
Jane Lattimer introduces an artifact that will allow Claudia and Jinks to enter Artie's subconscious in order to find out why he won't revive, but when they get there, it's a tricked-out, electrified version of the Warehouse, complete with guardians in the form of Vanessa, Mrs. Frederic, and MacPherson.
Myka and Pete visit Professor Sutton, the foremost scholar on a 16th Century count who was said to bring flowers back to life. They hope to find an artifact connected to the count, one that they can use to revive the blue orchid and suck the illness out of the world, but the professor's no help - he's been hitting the sauce pretty hard. Sucks to be the world. (Also, James Marsters, yay!)
Artie's brain creates rampaging, figment guardians that look like the people of the Warehouse. Claudia and Jinks get trapped in artifact cocoons by fake Mrs. Frederic just before fake MacPherson hunts them down. Jinks distracts the madman long enough for Claudia to make a break for Artie's office, where she'll be able to interact with her comatose mentor.
Sutton wasn't too soused to negotiate his way onto the mission. He tells the agents that the count had a ring that may have been the key to his flower power, but unfortunately the ring is in the count's tomb in the Parisian catacombs, and unfortunately, the key to reading the map that will get them there is in this lady's locked-up house. (Also, Polly Walker, yay!)
Claudia finally reaches Artie, but it seems that all of the henchmen he sent were guarding a fragile peace. Claudia has to fight to get Artie to remember what really happened, and when she does, things get a little scary. Artie puts up stubborn resistance. Claudia, however, will never stop fighting for Artie, and uses her will and her knowledge of what's right to oust him safely back into the real world.
Myka and Pete manage to knock the homeowner, Charlotte, out cold, but Sutton forgot to tell them one little thing: HE'S THE COUNT OF ST. GERMAINE! Yes, he looks good for 500 years old. They may have to overlook his shifty ways, since he found the key to getting them the ring, and time is running out before the sweating sickness kills half of the world's population.
Despite his many ignoble moves - including pocketing a priceless diamond enshrined in his own tomb - Sutton's last act is noble: he throws himself in front of a poisoned dart meant for Myka. (Sure, the darts were released BECAUSE he stole the diamond, but still.)
Pete and Myka apply the artifact to the orchid, and the sickness gripping the world retreats into a harmless-looking flower once again. They have saved the world, but will mourn their new, late friend.
Charlotte revives and manages to find the tomb, but when she looks around, she finds the diamond - and Sutton - missing. She curses the count - her husband - and ruminates that he isn't the only one with big plans for world domination. (Presumably. I mean, why else would you go to such lengths?)