A Library Adventure

You decide to take the stairs rather than risk the somewhat unreliable Library lift.

Making your way steadily up to the second floor and going through into the Library, you head towards the front of the building, which has large windows across its entire length.

Looking for someone in a green jumper, you pause next to the windows. You can see nobody on this floor.

The desks and PCs are all unoccupied and, from a cursory glance, the book stacks appear empty.

Suddenly, a noise to your left startles you...