Nicola Davies and Jenni Desmond's second collaboration: a spellbinding tour of the world's oceans and an important rallying cry.

We humans mostly live on land – so, we think that land is the most important thing there is. But if you look at Earth from space, you see our planet isn’t green or brown, like the land. It’s blue.

A child and their grandmother discover a "sea heart" on their nearby beach: a smooth, round bean, the size of the child's palm, which has travelled all around the world on the Gulf Stream's current. The unfolding story shows readers how the oceans of the world are closely connected – to each other and, in turn, to all of us.

Combining fascinating biology, spectacular artwork and an important climate message, Nicola Davies and Jenni Desmond’s latest book together is a magnificent celebration of our one wild ocean.