The final four episodes focus on the search for a dangerous relic known as the .

The trio uncovers that the mirror is actually a window created from the bones of seven tormented spirits.

The 2023 Netflix series Lockwood & Co delivers a gripping supernatural mystery, particularly in the concluding block of Season 1 (Episodes 5–8). This second half of the season primarily adapts the second book in Jonathan Stroud's series, The Whispering Skull .