Childhood sweethearts Holly and Gerry could finish each other's sentences. No-one could imagine them apart. Until, that is, the unthinkable happens and Holly is faced with the prospect of spending the rest of her life without her husband. Then, one day, a light appears at the end of the tunnel in the form of a surprise letter. Secretly, Gerry has left her a series of notes written before he died – delivered one per month – to gently guide Holly into her new life, each finishing with: PS, I love you.