The novel Star Wars: Sanctuary is meant to be a bonus episode of The Bad Batch
Briefly

The Bad Batch series follows a group of specialized clone troopers as they defy orders to eliminate Jedi and subsequently get caught in the conflict against the Galactic Empire. Initially seeking refuge in mercenary work, the group connects with both new allies and existing characters from Star Wars: The Clone Wars. The story continues in the novel Star Wars: Sanctuary, written by Lamar Giles, set after the events of the episode "Pabu," where the Bad Batch helps Pabu recover from a tsunami while undertaking an undercover mission at a high-roller auction.
"Going into Sanctuary, I wanted to give my fellow Bad Batch fans the feeling of an extended bonus episode where our favorite characters got exciting moments that felt fresh and familiar."
"The novel is set after the events of the season 2 episode 'Pabu,' where the Bad Batch joins the pirate and treasure hunter Phee on the peaceful island of Pabu."
Read at Polygon
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