Teenager Chloe has never been close with her Nan, Peg. When Peg is diagnosed with Alzheimer's and moves into the family home, Chloe is forced to become her stay-at-home carer overnight. Chloe reluctantly joins a local support group where she meets Sam who helps her realise how much things are soon about to change for her Nan. Chloe confronts Peg- what does she really want to do before she forgets? Chloe comes up with a list and decides to make Peg's summer unforgettable.