You investigate quietly

You slip around the side of the cottage to the back door, taking your shoes off before you open the door and quietly step inside. You listen carefully but hear nothing. You suspect that your nocturnal visitor is Tamara, back for another attempt to intimidate you or looking to be raped again, but it's possible that it's someone else, someone less controllable. With that thought you slide open a drawer and pick up a knife to use as a weapon if you need one.

Your ears pricked you move out of the kitchen into the dark hallway, your stocking feet silent on the floor. Listening at the foot of the stairs you hear faint movements from above and see a flicker of light pass the open door of your room. Silently, you creep up the stairs, listening for any sign that your approach has been noticed.

Reaching the landing you can see that your bedroom door is half open, with occasional flashes of a beam illuminating the room beyond. You creep forward silently, sliding your feet across the hardwood floor, the knife held in one hand. At the door you stop, listening to muffled sounds of movement within.

You hear the sounds of drawers opening, and the noise of searching. Is this Tamara looking for something to blackmail you with, or is it a sneak thief taking advantage of your absence.

Either way it's time to act. You could sneak in and surprise them in the dark, or flip the light on and use the shock of it to freeze them.