Nat and Gwen make a stealthy approach to the front door of the mad doctor's lair

Nat followed Gwen back around to the front of the tower, where they crept up near the porch.

"You have to be very careful here," Gwen warned him. She edged toward the front door.

It turned out that you had to be even more careful than that, because with no warning at all the porch opened up underneath Gwen and she fell into the dark, open pit that the porch had left behind.

Nat looked at the trapdoor. It was covered by a welcome mat that said "Go Away", and it was now swinging from side to side. Fast and painful, here I come, he thought.

And he dove in after he