The truth is, that they were less safe than Jean Valjean fancied. Perils of another sort and no less serious were awaiting them, perchance. After the lightning-charged whirlwind of the combat, the cavern of miasmas and traps; after chaos, the sewer. Jean Valjean had fallen from one circle of hell into another.

When he had advanced fifty paces, he was obliged to halt. A problem presented itself. The passage terminated in another gut which he encountered across his path. There two ways presented themselves. Which should he take? Ought he to turn to the left or to the right? How was he to find his bearings in that black labyrinth? This labyrinth, to which we have already called the reader’s attention, has a clue, which is its slope. To follow to the slope is to arrive at the river.

This Jean Valjean instantly comprehended.