The path grows broader as it comes to a close, opening into a marsh-like area covered by a low-lying fog. The fog makes it hard to see properly but, as if to make up for this, your hearing seems magnified, each sound clearer than usual.

There is the distinct and rather sharp sound of bullfrogs croaking and, as the fog lifts a little, you are able to make out a large amount of sticky, brackish water. Five stepping stones - large enough to support several people - stick out of it, wobbling slightly. If you step closer to the edge of the pond, you can detect movement beneath the unclear surface of the water. There is a splash, a few bubbles, and you realize something.

There is something in under the surface - and the stepping stones are your only way across.