You were never interested in a warfare, at least not in practice. But books were another matter. They always led you to another place in another time. Even those of war campaigns were interesting. When reading such a book, you fell asleep and stayed locked in the library. To make matters worse, in the distance you see enemy ships that are approaching! It's time to use your knowledge into practice and show teeth to your enemy. But above all, find means for your escape.

Looking at the scene with fountain and bookshelves:

Take a closer look at the left bookshelf.

Looking at the bookshelf:

Pick up two books with gray covers.
One is located in the top left area.
Second one is in the middle bottom area.
Pick up a gear.
Go back and turn right.

Looking at the scene with the doors and bookshelves:

The doors are locked so we'll need to find a way to open them.
Look at the left bookshelf.

Looking at the bookshelf:

Pick up a gear.
Take the coins. You'll need them for the fountain later on.
Pick up a book with a red cover.
You'll notice that you can open all the books you picked up so far. They are a part of the solution for a larger puzzle at the end.
Pick up an empty bottle.
Pull out an old book from the top shelf.
Sunlight comes through. You'll use it to ignite a paper.
To get the paper, use force on the old book.
You still need a magnifier to ignite it, so you'll have to come back here later.
Go back and turn right.

Looking at the scene with steam engine and bookshelf:

Pick up a crossbow from the floor.
Take a plate from the wall.
Take a closer look at the steam engine.

Looking at the steam engine:

Take a screwdriver.
Lift up the movable part of the panel.
There's your magnifying glass. You can combine it with the paper you ripped from the old book.
Engine is missing three gears. We still need one more.
Go back, turn left and approach the bookshelf again.

Looking at the bookshelf:

Use paper with magnifying glass on the sunlight. You get a smouldering paper.
Use breath to ignite it.
Go back, turn left and take a closer look at the fountain.

Looking at the fountain:

Pick up a bow next to the fountain.
Drop the coin into a slot.
Pick up floating screws.
Use an empty bottle on water to get a bottle of water.
Go back and turn left.

Looking at the scene with window and bookshelves:

Pick up a rope from the floor.
Move closer to a window.

Looking at the window:

Pick up another empty bottle.
If you look through a window, you'll see ships approaching.
We're gonna assemble a crossbow here and shoot them.
Start by putting crossbow body on a wooden stand.
Combine screwdriver with the screws and use it on the crossbow.
Next, attach the bow onto it.
And lastly, tighten the rope.
You should have a working crossbow.

Let's test it! Pull the handle.

Looking at the scene with steam engine and bookshelf:

You've dodge it in the last second! They made a hole in the wall. You can see another room behind the wall.
But first, pick up a gear from the floor.
Examine the steam engine again.

Looking at the steam engine:

Place the gears into the engine.
The engine is working.
Use empty bottle to get some hot air in it.
Head back and go through the hole in the wall.

Looking at the scene with statue and pedestals:

Use a plate to pick up dirt from the floor.
A statue holds the staff with aether on top of it. We need that eather to open the doors.
There are four pedestals in front of you. Each is marked with a symbol. By placing the right items on those pedestals, aether will drop.
You can get the links between the symbols and items from the books you picked up.

Once you have the aether, head back to the doors and escape!

That's it. Thanks for playing!