He tried it softly, cautiously, here and there, till he had passed over the entire space in which he knew the door must be, and yet the wall stood apparently blank and whole before him! The other walls seemed to be solid.
With beating heart, Timokles pushed once more at the partition.

It remained firm.

Trembling with the shock of his sudden entrapping, Timokles looked toward the room's far end.

It was as he thought.

The beast was not chained.