The Gum Thief - Douglas Coupland

Roger is a middle-aged 'aisles associate' at a Staples outlet, condemned to restocking paper for the rest of his life, and his young co-worker Bethany has realised she's facing fifty more years of shelving Post-it notes. Then Bethany discovers Roger's notebook in the staff room. When she opens it up, she discovers that he's writing mock diary entries pretending to be her - and weirdly, he's getting it right. The two workers strike up an unlikely yet touching secret correspondence. As their lives unfold, so too do the characters of Roger's work-in-progress, the oddly titled Glove Pond, a Cheever-era novella gone horribly, horribly wrong.