In Jodi Picoult's novel "Between the Lines," the phrase "Your hand fits mine like the last piece of a jigsaw puzzle" beautifully captures the essence of finding a perfect connection with someone. It suggests that when two people come together, they complete one another, just as the final piece of a puzzle completes the picture. This imagery conveys a sense of belonging and unity, highlighting how relationships can bring fulfillment and harmony into our lives.

The quote exemplifies the theme of love and companionship that runs throughout the story. It reflects the idea that true partnership involves not just emotional support but also a deep understanding and compatibility between individuals. Picoult uses this metaphor to show how meaningful relationships can transform our experiences, making us feel whole and understood.