After a health scare, Brighton-based Lou is forced to confront the fact that her time to have a baby is running out. She can't imagine a future without children, but her partner doesn't seem to feel the same way, and she's not sure whether she could go it alone. Meanwhile, in Yorkshire, Cath is longing to start a family with her husband, Rich. No one would be happier to have children than Rich, but Cath is infertile. Could these strangers help one another?