Part 1: Diving In is out now for just 99p.
More of a paperback reader? Fear not! The full novel, compiled from the three parts, will come out in February 2018.
If you like to plan ahead, you can pre-order it already.
Only the truly devoted manage to swim every day at Whitstable, because the sea’s only deep enough at high tide. So when Deb (ageing bikini, sunglasses) and Maisie (black wetsuit, swimming shoes, goggles) keep meeting on Reeves Beach, they strike up an unlikely friendship based on their love of swimming and their recent divorces.