Star Wars: The High Republic: Seeds of Starlight

On the oceanic world of Eiram, mysterious disappearances prompt the Jedi to send a Jedi Master and three Padawans to uncover the truth. Upon their arrival, they discover that the danger extends far beyond their expectations, linked to a threat stemming from the wreckage of the Starlight Beacon hidden beneath the waves, putting everyone at risk, including the Jedi themselves.