Tully and Kate support each other through good times and bad with an unbreakable bond that carries them from their teens to their forties.

The story of Tully and Kate, two unlikely friends, from their meeting as tweens in 1984 to the present. Kate, the introvert, and Tully, the coolest girl in school, form a bond that weathers every milestone in their lives, leading up to a tragedy in the present.