Read the excerpt from the strange case of dr. jekyll and mr. hyde.

twelve o’clock had scarce rung out over london, ere the knocker sounded very gently on the door. i went myself at the summons, and found a small man crouching against the pillars of the portico.

"are you come from dr. jekyll? ” i asked.

he told me "yes” by a constrained gesture; and when i had bidden him enter, he did not obey me without a searching backward glance into the darkness of the square. there was a policeman not far off, advancing with his bull’s eye open; and at the sight, i thought my visitor started and made greater haste.

how does this part of lanyon’s letter create suspense?

1. by mentioning that the scene is set in london
2. by describing a mysterious and nervous stranger
3. by mentioning the “pillars of the portico”
4. by describing someone lanyon knows well