At the end of the bestselling One Moment, One Morning, we left Lou happily involved with Sofia. We re-join her now as she faces another challenge...

After a health scare, Lou is forced to consider that the time to have a family is running out. The problem is: even though her eggs are viable, she and her partner don't have enough money for the necessary fertility treatment.

Meanwhile, up in Yorkshire, Cath, a little older than Lou, is longing to start her own family with her husband, Rich. But she's recovering from cancer, and as a result of chemotherapy is infertile.

Lou and Cath, brought together by a fertility clinic, end up egg-sharing – a process where a woman who has good eggs can donate them to another who needs them, in return for free IVF. As both women simultaneously try to conceive, with the same woman's eggs, the novel follows their parallel journeys to create a family – and as the foetuses grow, so does the novel.

Ultimately, what works for one won't necessarily work for the other, and The Two Week Wait, combining Sarah's deft exploration of raw emotions with the joy and resilience of friendship, is a gripping novel about love and loss in the lives of two women hoping for the same thing: a family of their own.