Sequence 8, Memory 1: Need help.

[Puppet627]

Could someone please help with with this memory? It's the first one in Sequence 8.
I've gotten to the part where Catarina was being held and I'm stuck where I need to go up the stairs and into the library..

[Piflik]

You need to go up the stairs and into the library...

There's a window open, where you can climb out of.