Immediately in front of them was a small hut, built apparently of sticks and bamboos, with a stronger framework behind.

The sloping roof was grass-grown and entwined with rushes.

The only apology for a window was a queer little hole set quite close to the roof.
"The sort of place where the Professor might keep some of his pets," Quest observed thoughtfully.

"We'll have a look inside, any way." There was a rude-looking door, but Quest, on trying it, found it locked.
They walked around the place but found no other opening.

All the time from inside they could hear queer, scuffling sounds.