An interesting theme of "deception" shows up in the story of Rahab of Jerico. 

Even more fascinating is the way a similar kind of thing happens slightly later with the Gibeonites, but the narrative frames it differently. Rahab is often lauded as a brave hero, but upon finding out who the Gibeonites really are the Israelites grumble and Joshua "says a curse". But they keep their word and do not kill the Gibeonites. We explore some of the similarities and differences between these deceptions, and are reminded of other Biblical examples that add to the dilemma.