In the ocean world, ruled by a strict and unjust caste system, every being is assigned its place in the food chain and society at birth. Molly Dikk, a depressed whale, struggles to fit in. Bad mother, bad employee, bad citizen, the life of the nonchalant Molly is turned upside-down the day she discovers the existence of Polly, her illegitimate daughter. Polly is the result of a one-night stand with a seahorse, eleven years ago. Considered a freak of nature, Polly has no legal presence in society and her mere existence threatens the natural order of the food chain: it is impossible to determine who can eat this mixed species. Forced to take on this new responsibility, Molly must learn how to be a mother as she tries to piece her life back together. But society is watching her now, and nothing is going right.