The top stair cracks

As your foot touches the top step, the wood cracks, breaking in the center, but managing not to give way entirely. You stagger forward, trip on the edge of the step and fall face forward on the wooden landing.
As you get a hold of yourself, you raise your head and look ahead. You're in a fairly long hall, probably as long as twenty feet. The hall is dark, but you can see the outlines of three doors to either side from the light behind them. Windows no doubt.
The last door on your left is ajar, you notice. Again, you hear a creaking sound, but this time, you know it's coming from that room. As you get to your feet, a shiver comes over you, and you wonder, do I really want to look behind that door, or any of them for that matter?