One Piece Chapter 27, page 10: The Plot

Kaya tries to calm him down, saying, "Wait... wait a minute... What are you talking about? How can Clahador be a pirate?" Usopp insists, "It's true! I accidentally overheard... a conversation that guy had with his comrade. That butler came to work for you because of your wealth! He became your butler in order to obtain your family's wealth! Tomorrow morning, he's going to let his pirate crew to attack our village! And then he's going to come and kill you!" Kaya stares at him in disbelief, asking, "What are you talking about, Usopp-san?"