January 1945, West London

The Waterway Girls are flourishing in their roles aboard the Marigold and have quickly established themselves as an invaluable and popular crew on the cut. But the VI and V2 rockets come increasingly too close just as someone from their past intrudes on their lives. It is then that Sylvia is torn between her promises and her love for those closest to her.

Polly and Verity, who are still waiting for their sweethearts’ safe return, soon find they are also fighting for everyone's happiness.

When all seems lost, though, there is always a glimmer of hope to be found...