Suzanne Cater

I am rereading the Survivors series, and l’m enjoying the books all over again. I am now reading Only a Promise (Ralph and Chloe). I seem to remember a novella/short story about Chloe’s brother, Graham. Is that story available and where might I find it?
I love your books and am waiting impatiently until November for your next book. Being “a lady of a certain age” myself, I’m thrilled that Matilda is getting her own book!