Myka and Pete hurry to the Warehouse, plagued by Pete’s very very very very very very bad Vibes. Artie has rampaged through the Dark Vault, scattering the dangerous artefact looking for the Astrolabe (which Mrs. Fredericks has already given to HG Wells to take away and hide) and they find Leena’s body. It’s true what happened last episode – Leena is, indeed, dead. On the other end of her fornsworth, Mrs. Fredericks, visibly shaken, upset and grieving tells them it was Artie who did it.
Claudia, Myka and Pete talk to Mrs. Fredericks and Brother Adrian about Artie being the evil unleashed, including the history of the Astrolabe doing the same thing during the French revolution. Claudia is furious and grieving for Artie and him not being evil – just whammied – and Mrs. Frederick tells them they must find him before he hurts anyone else. She reminds them how dangerous Artie is, what an expert he is on the Warehouse and how much he knows their strengths and their weaknesses.
In the Warehouse, Pete thinks he sees Leena, but rushing out there is no-one there, causing more very well acted grief from all of them. And Artie shows up, saying he can feel there is something wrong. They see this as hopeful, but he quickly says the only thing that can fix him is the Astrolabe, he needs the Astrolabe and is quite vehement about it. But they know what would happen if Artie reset time – the destruction of the Warehouse and Pandora’s box – and they can’t let him have it. It’s then that they find he’s not there – he’s just a hologram. He says he’s not Artie, Artie is dead and was a slave to the Warehouse and he’s going to use the Astrolabe to set him free. It’s at this point there’s an explosion in the Warehouse, setting fire to the files from Warehouse 8 from the Holy Roman Empire. They contain the fire and guess there was something in the section Artie was trying to hide that may be connected to the Astrolabe.
In the Vatican, Jinks, Mrs. Frederick and Brother Adrian are researching. They find an old text that says if any man lives the same day twice they will life their life as two – a dual personality and the darkness will overcome the light, the evil will overwhelm his good, irreversibly changing him.
Pete continues to see Leena’s ghostly form, which leads him to a cabinet, hidden in it he finds papers and pictures of the knife that have been plaguing Artie’s visions. According to Mrs. Fredericks, the papers are HG’s research. She tells them about Artie’s visions of Claudia stabbing him with it, Claudia says she never would and just because Artie dreamed it doesn’t make it true – Mrs. Fredericks agrees but also says it doesn’t mean it’s not true. It could be the dagger was in Artie’s dream because his dark side was trying to push him away from it They decide the dagger is important and, looking at the research find it was Francesco Borgia’s dagger that was stored in – Warehouse 8.
Using Claudia’s computer skills that outstrip Artie they find out he is travelling to Budapest – and travelling under a false name that is an anagram of his real name, suggesting there is something in him that wants to be caught. He’s tracking down the dagger.
While Myka and Pete go to Budapest, Claudia has Artie’s fake identity listed as a terrorist so he is delayed by the police in Hungary. Myka and Pete have found the dagger – it’s in an ambassador’s private art collection that has been lent to a museum in Prague – and they follow. Claudia has done some research, Warehouse 8 had an orchid that caused a severe, lethal plague that was encased in an impenetrable box – which the dagger can open. If Artie can open the box, unleash the orchid, he can force them to use the Astrolabe because the death toll from the orchid will outstrip the damage caused by the Warehouse being blown up.