Tully attempts to face unresolved loose ends from her past. But her choices lead to a potentially unforgivable mistake that impacts Kate's life.

Kate learns that dealing with an ex is always tricky, no matter the decade. After years of never saying sorry, Tully struggles with accountability.

Kate has often felt invisible next to Tully through the years. But amid major changes, Kate realizes she may need her best friend by her side.

From bra-stuffing to breastfeeding, Kate experiences several bumps in the road on her journey from a self-conscious teen to a first-time mother.

A bridal shower stirs up resentments and memories, an awkward encounter leads to a life-changing question, and a tragedy shakes teenage Kate's world.