When they were fifteen, Willa, Luz, and Britton's friendship was everything.
When they were sixteen, they stood by each other no matter what.
When they were seventeen, they went through the worst.
And when they were eighteen, Willa ruined it all.

Now, it's the week of graduation, and Willa is left with only a memory box filled with symbols of the friendship she destroyed: A book of pranks. Corsages from a nightmarish homecoming. A greasy pizza menu. Greeting cards with words that mean the world...

It's enough to make Willa wonder how anything could tear her, Luz, and Britton apart. But as Willa revisits the moments when she and her friends leaned on each other, she can't avoid the moments they leaned so hard their friendship began to crack.

As Willa tries to find a way back to Luz and Britton, she must confront the why of her betrayal, and answer a question she never saw coming: Who is she without them?