Lachlan Wallace is stuck at home after a car accident stalled his army career. With months of physiotherapy still to endure and only his rescue dog and cat for company, he's taken to gazing out of the window, watching the world spin on without him. And then he notices a vase of flowers on the windowsill of the apartment opposite his. Drawn to their hope and colour, he decides to reach out and sticks a message in his window...

Bethan Gwynne is a stranger in a new town. Bringing up her son Noah by herself, she is slowly rebuilding her life, but loneliness is one obstacle she has yet to overcome. She's intrigued by a glimpse of her neighbour in the apartment across from hers - and then, one evening, she sees a message in his window just for her: