A Door into Ocean is a science fiction novel written by Joan Slonczewski and published in 1986. The story takes place on the planet of Shora, which is entirely covered by water and inhabited by a race of women called Sharers. The Sharers possess the ability to manipulate the ocean and its creatures, and they live in harmony with their environment. However, their peaceful existence is threatened when a group of male colonizers from the planet Valedon arrive and attempt to exploit the planet’s resources.

The novel explores themes of feminism, environmentalism, and the consequences of colonialism. It also delves into the complex relationships between different species and the importance of empathy and understanding. A Door into Ocean is a thought-provoking and engaging read that challenges readers to consider their own relationship with the natural world.