There are times when surprise appearances are fun. Think of a special birthday celebration when guests huddle in darkness waiting for the celebrant to appear so they can jump out, shouting, “Surprise!” Giggles often result and great fun is had by all.
But not all such appearances are met with joy. Imagine a scenario where your protagonist opens the door and a masked person barrels in with gun pointing at her chest. The resulting emotions are fear, terror and confusion. She might beg for her life as she’s forced to unlock the safe deposit box, pull out treasured jewelry or uncover family heirlooms.
Perhaps your protagonist is shopping at a technology store when hooded, armed thieves charge in, demanding that everyone fall to the floor. The gunmen waved weapons around and threaten anyone who raises their heads, just a bit.
Your task is to write a scene in which someone appears unexpectedly and threatens your protagonist. A good beginning place is the normal world, that situation in which she is doing something ordinary. That gives readers a chance to get to know who she is based upon her life, her abode and her thoughts as she goes about her day.
Something happens that shatters her peace and that puts her in danger, fighting for her life.
Details are important. You will also need dialogue so that we can hear the words the invader uses and what she says in response.
Have fun with this one.