Jess and Milly have been best friends since childhood, sharing everything from secrets to life's milestones. Milly, a successful publicist with a family, seems to have it all, while Jess leads a simpler life with her partner, Jago, as they struggle to start a family. Their bond is tested when Milly is diagnosed with an aggressive form of breast cancer, and Jess steps up to support her through the harrowing treatments and emotional turmoil. As Milly’s health deteriorates, her glamorous life begins to unravel, and the strain affects her relationships with her husband, Kit, and her two children.

Simultaneously, Jess faces her own challenges as she finally achieves her dream of becoming a mother. The two friends navigate their respective crises, finding comfort and strength in their enduring friendship. Jess balances her time between being there for Milly and preparing for her new role as a parent. The story delicately weaves their parallel struggles and triumphs, highlighting the power of friendship and resilience in the face of life's unpredictability. Through laughter, tears, and moments of profound connection, Jess and Milly’s bond illustrates the enduring impact of true friendship against the backdrop of life-altering events.