Tideline (novel)

Tideline is a 2005 novel by American author Elizabeth Bear. The novel explores themes of motherhood, duty, environmental collapse, and the impact of technology on humanity. It is set in a post-apocalyptic, flooded world where remnants of human civilization struggle to survive amidst rising sea levels and mutated creatures.

The story revolves around Casse, a woman living on a small, self-sufficient island community. She discovers a heavily pregnant, genetically engineered mermaid washed ashore and is forced to care for her. Casse grapples with the ethical implications of the mermaid's existence and her responsibility to protect the unborn child.

Tideline blends elements of science fiction, fantasy, and mythology, creating a unique and atmospheric reading experience. It has received critical acclaim for its evocative prose, complex characters, and thought-provoking exploration of timely social and environmental issues. The novel is often categorized as part of the burgeoning cli-fi (climate fiction) genre.