Shower Curtain Height

The wall next to our bathroom window has a long and narrow 30 cm high, then the wall above. The window is about shoulder height when standing in the shower. Will need a shower screen to be mounted on a wall full? I want a shower screen as our bathroom is tiny and I'm pretty moldy shower curtain that make the room look even smaller. Not sure if it is possible because of the gap.

It obviously needs to be screwed to the wall, however, if a plastic shower curtain dose not allow water on the edge of a heavy glass window will certainly not
Good luck John

Hi - I'm assuming a short (top) section of the screen overlap, where the window opening, yes?
If so - the screens generally have a U-shaped profile which corresponds to the first wall, then the screen corresponds to the profile. If this is the case, drill some extra holes for attachment to the rear of the profile where it is screwed to the wall. Drill the highest hole a few inches down from the window. It does not matter how many holes you drill in the profile to fix the wall, they are covered when the screen is fitted.
When you are sure that the profile is securely apply a dab of silicone on the screw heads, this stop any chance of getting water beyond the screw.
When the screen finally rose to your satisfaction, a bead of sealant to the angle between the profile and the wall tiles, it will prevent water from seeping behind the profile and also to give a little order of arrival.

Fix a batten vertical bathroom to the panel height (your choice of wood), so it covers the gap through the window, then painting and so can screw varnish.You panel batten, work.