The four girls are demoted back to basics after they make a big deal out of saving the prince in the previous season. They are not allowed on any mission, even as a suspicious figure, Carson Lazarus, a criminal mastermind, is released from jail. Soon after, a figure who calls themselves "Retro" causes all technology to malfunction and glitch in Maywood Glen.

McKeyla and Cam question Eli at his grandmother's house and follow him to the docks, where they learn about a diabolical plan.

Retro sets a trap for the girls, which causes the Quail to advise them to leave town.

The girls visit NOV8's amazing headquarters, where the Quail gives them a new mission involving an old friend. But something strange is afoot.

Bryden analyzes Retro's voice, which gives the girls a new idea about his or her identity; and they need to use their wiles when a blackout threatens to delay their investigation.

When a new point of evidence involving HAVOC points to Carson Lazarus, Adrienne and Bryden comb through her trash looking for clues.

Ember's itching potions sends Grady to the nurse's office, where Adri and McKeyla question him. Bry discovers a mysterious clue in EliTe's music.

The Quail allows the four girls to figure out this case. McKeyla becomes increasingly suspicious of Kyle, but soon dismisses the idea of him being Retro just because he knew she liked fro-yo and was wearing a black hoodie, very much like the one Retro wears. They also suspect Devon D'Marco, a troublemaker, as she spray-paints handcuffs on a picture of a drone on a poster about the upcoming launch. All four girls except Bry, who has to babysit, make ways to get detention on Saturday with Devon. Bry runs a vocal recognition as Cam and Adri confront the troublemaker and McKeyla looks through her bag. Devon is proven to be innocent, just using the school's 3D printer to make skulls for her nana's birthday.

Devon uses art to help Bryden and Adrienne work through their differences. McKeyla has a difficult talk with Kyle about their relationship.

The girls finally learn who's responsible for stealing the prototype. But is it too late to stop the evil mastermind's plot?

While the girls dig for more information on Bobby Stone, Adrienne and Ember make a surprising discovery about Stone Water -- and where it comes from.

The girls arrive at the Maywood Glen art opening to search for Vex, but they have no idea what the elusive mastermind looks like.

McKeyla homes in on a surprising new suspect: Camryn's dad! Meanwhile, Ember and Cam wonder if fellow camper Gordon is up to something.

The girls act fast and use their skills to name a suspect when someone threatens to sabotage a state-of-the-art urban development.

A new theory emerges as the girls turn their attention to the school dance -- and having dinner at Bobby Stone's cutting-edge "smart" home.

A familiar face from McKeyla's past steps up to help as her family connections to the case grow clearer. And "Bry-ence"? Well, it's bigger than ever.