How does Gemeinhart’s choice to alternate viewpoints between Mark and Jessie affect readers’ judgment of their actions?

Mark tends to focus on the effects of light in photography: “I lifted the camera from around my neck, framed the lighted windows of the restaurant right in the middle with the night’s blackness all around, and snapped a picture” (29). How does the light and dark contrast inform readers about Mark’s perspective and worldview?

Mark’s objective is ultimately a quest for truth, but he must lie to slip past different checkpoints and obstacles. What does this dissonance suggest about the themes of truth running through the novel?