In Resident Evil 1, Jill found the two last books. The first and last book contained some supernatural secrets that Jill could not explain, as well as some explanations about the strange events and supernatural phenomena in this world. This information was very important to Jill because if she couldn't master these secrets, she might lose her superpower. The second and last book recorded the formula of a drug that Jill and Chris found before the outbreak of Resident Evil that could slow down the spread of the virus. This drug was once studied by a scientist, but an accident occurred during the experiment, causing the drug to fail. Jill and Chris discovered the formula during their investigation and tried to recreate the drug to save the world.