He went to the door, opened it, then turned around and said to me, “I’ll come back to make sure you’re still here.” . . .

Then he said again, “I’ll be back to check on you. One wrong move and off you go to prison too.” He turned and shut me into the room alone.

I had no idea where he’d gone. I had no idea what was going on in the rest of the house. I was in a terrible mental state. I felt as though I were falling into a bottomless hole. What could I do? I sat down again. I was in shock.

—Anne Frank Remembered,
Miep Gies

Why is this paragraph so suspenseful?

Gies tells the story as it occurs, when she doesn’t know what will happen.
It isn’t clear whether Gies will survive the situation.
Gies is in a truly terrible mental state and is becoming depressed.