The Hunters discover a cryptex, but Erik secretly takes it before they can find out what it contains; Max hears from his birth parents; the police accuse Erik of art theft.
Erik gets taken to the police station, where Daniel tries to find the evidence against him; Max talks to his birth parents; the police arrive to search the house.
The Hunters meet a young girl named Evie - and her necklace has the same crown symbol they discovered in the cryptex! And Erik reveals that he has a special connection to Evie.
The kids find evidence that could prove Erik's innocence. But someone hacks into Sal's computer and erases the footage! And Max realizes there is something strange about how his birth parents tracked him down.
Evie's stepmother, Lucia, tries to take her back; the Hunters attempt to track down information on Lucia by visiting Evie's old neighborhood, where they meet tech-loving Jennie and obtain footage that gives them their next clue.
Tess finds an old Ruybosch family tree and realizes it's marked with the same crown symbol. Jenny helps Sal investigate his hacker. And a comic book publisher approaches Jake with an interesting offer.
Hunter and McCall try to solve a bank robbery and murder while also attempting to cope with the double and triple-crossing schemes of a small time criminal who once saved Hunter's life - and won't let him forget it.
The reverse heist is on, but the plan involves many risky elements. Will the Hunter kids make it out of Lucia's house with the vase before being caught?
The Hunter kids realize one of the Relatives is a mole and devise a plan to uncover him/her. And Daniel can no longer work on the case now that they police have enough evidence to prosecute Erik.
Is Daniel working with the enemy? The Hunter kids confront him and he reveals a new piece of evidence. Each of the kids does their part to find the spy, but it is Anika who unwittingly uncovers the next piece of the puzzle.
The Hunters approach Detective Simon with their evidence, but are dismissed. Back at the house Apoll0 appears with news that he can find the hacker. A daring mission ensues and leads the kids to an abandoned railway yard.
Inside the hacker hideout they discover a map to a hidden room in the Hunter house! When the kids return home to find it, Max contacts them through the telegraph machine with one word - DANGER! Evie finds what the other kids couldn't.
Apollo reveals the hacker's identity and plan. Anika and Jake attempt to contact Max. The Hunters confront the thief, but he escapes, locking them in the secret room.
Two mole suspects remain! Tess and Sal get to work on discovering exactly who the mole is. Meanwhile Daniel and Anika spy on Lucia, and Sal and Jennie have a problem - the hacker knows he's been tricked.
When Erik is forced to go to the police station, Diane shows up and takes the crown. The kids finally uncover the true identify of the mole. They need to tell the other Relatives immediately - but will it be too late?
Tess and Jake try to convince the relatives that the mole truly has framed Erik, but Sal's evidence is needed to prove the mole framed Erik- and to prove Erik's innocence- and to stop the thieves from escaping with the crown.
