In a time ruled by fair-skinned kings and racial divides, the son of a fair-skinned king and mud-skinned peasant, Marcious Leojé, spends his days far beyond his father's kingdom in the muddy mangroves with his best friend, Etel Duetman. Here, they form an unusual kinship with the native crabs and build a mud kingdom. These two mud-skinned teenagers feel invincible within this playground-sized fortress. The discrimination within the kingdom cannot reach them and the mud walls provide a sense of security. However, they soon learn that their kingdom is nothing more than a mud wall, as it is unable to protect those they love. Cast into despair and the unknown world, they must learn to build a kingdom capable of protecting those they love. Along their journey they encounter people who show them the products of love, war, and despair. However, Marcious cannot envision his product, his own kingdom. Everywhere, being mud-skinned is worse than murder, and being "different" is worse than being mud-skinned. Will his vow to create a kingdom withstand the rising tides or will it wash away like that of his childhood?