Every summer, Laney's family visits their cottage on Tidnish Beach. Summertime on Nova Scotia's north shore is slow and sweet: there are long days in the water until fingers turn pruney, bottomless glasses of cherry Kool-Aid, and bonfires with the other families summering along the shore. But this year the baking heat and bright red sand provide cold comfort. This year Laney's little sister, Jenny, is gone. Ten-year-old Laney grapples with the loss. She carries immense, secret guilt that she can only work out by writing letters to her sister.