: George’s research reveals that Edmund Bickerstaff, a Victorian doctor buried in Kensal Green, was an occultist who performed ritualistic experiments to create "sources" from human remains.

: While infiltrating the library, Lockwood and Lucy encounter a mysterious, skilled fighter known only as the Golden Blade . After a high-stakes sword fight, they escape by triggering the salt sprinklers to create a diversion.

: George translates the retrieved papers and discovers the "recipe" for the Bone Glass: it was crafted from the bones and spirits of seven tortured individuals to serve as a window to another realm.

: Lockwood meets with his contact Flo Bones , a relic hunter, who warns them about the dangerous underworld figures seeking the Bone Glass, including the Winkmans.