Little Sofia and her grandmother spend the summer months on a remote island. Their daily conversations about mundane and philosophical topics, about life, relationships and loss, are simple, funny, wise.

In The Book of Summer, a grandmother and granddaughter Sofia spend the summer months together on a deserted island, talking, thinking, arguing, going on adventurous expeditions along the coast and by boat on the sea... They feel themselves and the opposite one to the full.

One of them is like a bud about to unfurl, the other a withered rose, its last petals falling noiselessly to the ground, where she herself will soon rest. Sad and happy at the same time, Janssonianly beautiful, open to double reading - both the child's and the adult's.