England, 1939. Sixteen-year-old Sally Turner is the sole caregiver for her six-year-old brother Ernie, who has polio. Their irresponsible mother, Florrie, abandoned them as soon as the war broke out, while their father was called up. The two children find refuge in Cliffehaven, a small town on the south coast of England. There, they are taken in by Peggy Reilly, the owner of the Seaside Boarding House. With the Reilly family, Sally finds an adoptive home that will allow her to flourish, and a job in a uniform factory, where her talents as a seamstress will be revealed. The young girl also meets John Hicks, a handsome firefighter. But Florrie's arrival in Cliffehaven threatens to upset this fragile balance... In the midst of World War II, this new saga features characters gravitating around the picturesque couple who run the boarding house. And the Sky Will Be Blue is the first part.