As the mystery surrounding Desmond Heart grows, the sisterhood is at real risk in 'Dune: Prophecy' Episode 3. Here's what you need to know.

Dune: Prophecy takes place about 10,000 years before the events of Dune, where Paul Atreides would realize the prophecy of the Lisan al-Gaib, a plot put into motion by the Bene Gesserit. However, the Bene Gesserit themselves seemed pretty fearful of Paul realizing that power, which could have seeded itself in the order thanks to Desmond Hart.

The series chronicles the early evolution of the Bene Gesserit order into a superpowered mystical sisterhood with great political power.

If you're waiting impatiently for Timothée Chalamet and Zendaya to return in the third Dune film, HBO's latest must-watch TV series Dune: Prophecy is the answer to fill your Sunday-night appointment viewing.

Dune: Prophecy Episode 3, titled Sisterhood Above All, will see major plot twists in an increasingly charged storyline for both Desmond Hart, a tool of the Emperor, and Valya Harkonnen. The tension was high in Episode 2, and it will continue to establish events that will affect the trajectory of the series as a whole.