Meet Rosemary, 86, and Kate, 26: dreamers, campaigners, outdoor swimmers...
Rosemary has lived in Brixton all her life, but everything she knows is changing. Only the local lido, where she swims every day, remains a constant reminder of the past and her beloved husband George.
Kate has just moved and feels adrift in a city that is too big for her. She's on the bottom rung of her career as a local journalist, and is determined to make something of it...