"The internationally bestselling first novel by Megan Hunter imagines new motherhood in the midst of an all-too-possible climate change catastrophe. As London is submerged below flood waters, an unnamed woman must take to the road with her newborn son in search of safety." -- Back cover.

As London is submerged below floodwaters, a woman gives birth to her first child, Z. Days later, she and her baby are forced to leave their home in search of safety. They head north through a newly dangerous country seeking refuge from place to place. The story traces fear and wonder as the baby grows, thriving and content against all the odds.