I don't know about any map

"Do you have any idea why did he kill my father, grandfather as well as his own father?"John asked after listening to his grandmother carefully.

"I never thought that this Lucas would become an enemy of our family. I didn't know that he killed your father and Oliver as well as his own father. Maybe he holds grudges against me and Oliver for my rejection of his marriage proposal. But I don't think that someone can kill so many people only for rejection of marriage proposal. Maybe there is something that I don't know."

"Do you know about the map which Lucas and his companion were searching?"

"No. I don't know about any map. Oliver never told me about it. But I heard about it before."

"What? You heard about the map?"