Read the following selection from the story. "He didn't know the tale to tell it. The knight forsook his own country and even his true name. Pegeen, the wizard's wind-tossed spell has chosen rightly. The parchment drew you here today. When you touched it, magic summoned me."

"You are enslaved?" Pegeen felt horrified.

"I'm as free as merrows and minnows. The spell asked me to serve as a messenger. I consented, hoping to pass along what I know about the king's duplicity in confidence."

"I'll keep your words close."

"That's wise. You're to unlock 60 doors swiftly, using a key ring whose keys are unmarked."

"Are the keys enchanted?"

"No. However, an ancient protective spell ensures they can't be removed from the ring. Unfortunately, it's creaky old magic that did not disallow adding keys, which the devious king has done. Now the ring holds sham keys as well as useful ones."

"I don't understand why he's bent on cheating."

"It's not the gold he may lose that troubles him. The doors depict maps showing parts of his realm. If you pass the test, an enchantment hands over those portions of his kingdom to better faerie kings and queens."

Which sentence from the selection helps explain the meaning of the word “duplicity”?