Book excerpt: As children, Jennifer Harris and Cameron Quick were both social outcasts. They were also one another's only friend. So when Cameron disappears without warning, Jennifer thinks she's lost the only person who will ever understand her. Now in high school, Jennifer has been transformed. Known as Jenna, she's popular, happy, and dating, everything "Jennifer" couldn't be -- but she still can't shake the memory of her long-lost friend. When Cameron suddenly reappears, they are both confronted with memories of their shared past and the drastically different paths their lives have taken. From National Book Award finalist Sara Zarr, Sweethearts is a story about the power of memory, the bond of friendship, and the quiet resilience of our childhood hearts.