When Zach comes for his annual vacation, Gramps has just learned that he has Alzheimer's. Together, they start a ""Memory Box"": as they reminisce about other years, Gram writes down the stories; they also include this summer's events and find old photos to put into the box. Meanwhile, Gramps has some days when he wanders off or talks to people who aren't there; still, the summer is a happy one despite the anxious times. The realistic conclusion is bittersweet: ""This time Gramps and Gram had taken care of me. Next summer, Gram and I would take care of Gramps. And the summers after that...well, we'd figure out something."" Cunningham's spare, handsomely designed paintings nicely reflect the text's quiet tone; his people are sturdy and affectionate while his lakeside scenes glow with precisely observed light. Upbeat, but also sensible and perceptive.