Captain Burnham and U.S.S. Discovery are sent to retrieve a mysterious artifact hidden inside a 800-year-old Romulan vessel - but find that they're not the only ones on the hunt. Meanwhile, Saru is offered the position of a lifetime.

On Saru's last mission as Captain Burnham's Number One, the team ventures to a seemingly abandoned planet to hunt for what might be the greatest treasure in the galaxy.

On Trill, Captain Burnham, Book, and Culber must pass a dangerous test to prove themselves worthy of the next clue. Adira reconnects with Gray and Saru's first day as ambassador is complicated by his engagement to T'Rina.

As the race between Discovery and the bounty hunters L'ak and Moll intensifies, an unexpected weapon forces Burnham and Rayner to work past their differences to save the rest of the crew.

Captain Burnham and Book journey into extradimensional space in search of the next clue to the location of the Progenitors' power, while Rayner navigates his first mission in command of the U. S. S. Discovery and Culber opens up to Tilly.

Captain Burnham must consider breaking the Prime Directive when a local tradition in a pre-warp society threatens Tilly's life. Culber tries to connect with Stamets and Adira steps up when Rayner assigns them a position on the bridge.

With Moll and L'ak in custody, the Federation is pulled into a diplomatic and ethical firestorm when the Breen demand they be handed over. Meanwhile, Book looks for ways to help as Tilly, Adira and Reno work to decipher the latest clue.

When Burnham is trapped within a "mindscape" designed to test her worthiness to retrieve the Progenitor's powerful technology, Book, Rayner and the crew of the U. S. S. Discovery must hold off the Breen long enough for her to escape.

After Moll and the Breen capture a mysterious structure that contains the Progenitors' power, Captain Burnham must lead a covert mission to retrieve it before the Breen figure out how to use it.

Trapped inside a mysterious alien portal that defies familiar rules of time, space and gravity, Burnham must fight Moll - and the environment itself - in order to locate the Progenitors' technology and secure it for the Federation.