The writing below is from a book by David Sedaris, and I would like to know who this suspect is. Is it a guy from the first paragraph? or one of the guys from the second paragraph. Or It is more like suspects from the second but a singular form, The suspect, is used because.. because maybe the same rule has been applied as, "The French" to mean "French people"?

ANYYONE WHO WATCHES EVEN THE SLIGHTEST amount of TV is familiar with the scene: An agent knocks on the door of some seemingly ordinary home or office. The door opens, and the person holding the knob is asked to identify himself. The agent then says, 'Tm going to ask you to come with me."
They're always remarkably calm, these agents. If asked "Why do I need to go anywhere with you? " they'll straighten their shirt cuffs or idly brush stray hairs from the sleeves of their sport coats and say, "Oh, I think we both know why."
The suspect then chooses between doing things the hard way and doing things the easy way, and the scene ends with either gunfire or the gentlemanly application of handcuffs.

Thank you,

The "suspect" is "the person holding the knob". The French has a plural meaning because originally French is an adjective and a plural noun denoting people can be formed by placing "the" before an adjective:

The rich like money.

Okay, thank you for the great explanation.