The Black Tides of Heaven is a 2017 LGBT fantasy novella by Singaporean author Neon Yang.

The story centers around the twin children of the Protector, whose magic powers cause them to become entangled in the political machinations of their mother.

Sanao Hekate, The Protector, rules her empire with the help of Tensors, people who can control elemental forces known as the Slack.

The Tensors and Machinists are developing modern technologies such as guns and bombs, increasing violent conflict throughout the empire.

The Red Threads of Fortune was written first, and takes place after the events of The Black Tides of Heaven.

[3] Geeks OUT praised the novella for its treatment of gender identity, as well as its exploration of wealth inequality.

Yang was beaten to most of these awards by either Ellen Klages's Passing Strange[10][11] or Martha Wells's All Systems Red.