With their friend kidnapped by a rival treasure hunter, Jess and her best friend, Tasha, hatch an elaborate plan to get him back, leading to a ransom exchange on a WWII warship, where Jess realizes this treasure hunt is too dangerous to continue. But will all that change when Liam Sadusky lets her in on one of his own family secrets?

After Jess discovers her late mother’s involvement in the treasure hunt, Jess becomes even more determined to unravel the secrets her mother never told her about their past. She enlists the help of her friends and Liam. This newly formed team of treasure hunters bonds as they decipher a clue handed down by the Masons and embark on a risky mission that sends them to a mansion once owned by and American icon.

For the first time ever, Jess finds herself in a puzzle-solving slump when she can’t crack the clue found in the last episode. Her personal life isn’t any less confusing as she tries to figure out if she and Liam have romantic feelings for each other. At the wake for Liam’s grandpa, Jess and her friends meet famous treasure hunter Riley Poole (from the National Treasure movies) and enlist his help. Jess’s puzzle-solving skills are put to the test when she and Riley get caught in a deadly trap.

Jess sacrifices everything to confront her dad’s killer to find the last piece of the map. But that meeting rocks her world as she learns that nothing is what’s expected on a treasure hunt, propelling her to make a dangerous decision that could land her in prison for life.

It's a matter of life and death when Jess and her friends embark on their most impossible caper yet. Meanwhile, Liam teams up with his grandpa's home care nurse, Myles, in a desperate attempt to bring down Billie and her secret organization before they harm Jess.

After getting captured by Billie, all hope of saving the treasure seems lost for Jess. Tasha, Oren, Ethan, and Liam try to track Jess down using Tasha's tech skills. Meanwhile, Liam finds a hidden cypher left behind by his grandpa, which holds the truth about Billie and the mysterious Salazar.

With his identity finally revealed, Salazar joins Billie in the final leg of the treasure hunt, where Jess and her allies try to outwit Billie using Jess’s knowledge of puzzles and history to escape and protect the treasure.