An alien presence arrives in the ocean off the coast of Lagos, Nigeria, triggering a global ecological and existential crisis.

Biologist Adaora struggles to understand the sudden appearance of the alien entity, a bioluminescent creature that emerges from the sea and begins to communicate through a series of complex patterns. As the world grapples with this unprecedented event, Adaora finds herself at the center of the unfolding mystery, caught between scientific inquiry and the profound implications of humanity's first contact. The narrative explores themes of environmentalism, cultural identity, and the unknown, set against the vibrant backdrop of a rapidly changing Nigeria.

Nnedi Okorafor's 'Lagoon' is celebrated for its unique Afrofuturist vision and its prescient exploration of ecological themes intertwined with alien contact. Critics often highlight the novel's vibrant setting in Lagos and its compelling blend of scientific curiosity with cultural commentary. The narrative's focus on environmental consciousness and the complexities of first contact resonates with readers seeking thought-provoking science fiction. The book is frequently praised for its imaginative scope and its ability to ground speculative elements in a richly realized contemporary African context.