Montresor wants to kill Fortunado. He felt that he was disrespected by him. He trys to get close to him and figure out a plan to kill him.
Montresor has devised a plan to kill Fortunado. Fortunado doesn't know it and acts like nothings wrong. He's also an Alcoholic and is currently drunk.
Montresor has Fortunado help him with something in a cave. During this, Montresor continues to give fortunado alcoholic drinks so that he can keep him drunk. This makes it easier for Montresor to kill him.
Montresor leads him down and into some sort of a hole in a wall. One Fortunado is in, Montresor begins to build a wall of bricks to keep him in. He takes a few breaks in between layers.
Montresor begins a the last tier of bricks. By this time, Fortunado is no longer drunk and is aware of what is going on. Fortunado starts asking what is going on and why is he trapped.
Montresor checks on Fortunado and he doesnt make a sound. So he puts in the last block and leaves him to rot. Never to be heard from or seen again.