What did the note in the purse say? Who put it there?

The sisters stop at a store called El Gallo on the way to Puerto Plata to buy sewing supplies for their company. They decide to buy purses, too. But the salesclerk, Jorge Almonte, recognizes them and puts his card in Minerva's purse. As they drive past La Cumbre, they see Captain Pena's car parked there, and they realize there must be an ambush up ahead. This is corroborated by the card Jorge Almonte slipped Minerva, on which he has written, "Avoid the pass." But there is nothing to be done, so they keep driving.