Plot
Three years after Dan Morgan defeated his father, McCaffrey, and imprisoned him, Dan now runs his own private security firm; his wife, Jessica, is a triathlete coach, and Nina is studying abroad in London. Jessica was offered a promotion to be a coach at Ohio State University, which means the family will have to move to Ohio. Dan feels like his family is slowly moving apart, now that Kyle is 18.
Since Nina can't return home for Christmas, Dan takes his family to see Nina, using a job task to check the bank's security system. There, they find Nina with a new boyfriend, Omar, who displeases Dan. At the bank, Dan meets Finn Clarke, who hired him for an assessment. Suspicious, Dan suspects Finn wants him to perform a bank heist disguised as an inspection to steal a deposit box with a digital key. Dan also learns Finn is actually his little half-brother, the child of the maid his father had an affair with. Finn threatens to kill his family if Dan doesn't cooperate. They escape with Dan holding Finn at gunpoint, and Jessica, kidnapped by Finn's men, is released with a gun taped to her hand, making them fugitives. Dan had stolen the digital key, and Finn chases after them.
Pursued by Finn and the authorities, Dan ditches the digital key to throw off Finn while he and Jessica escape with their kids and Omar. Dan tells them he didn't know Finn was his brother, and Finn has the digital key that gives him access to his late father's computer servers, which hold endless funds, his assassins, and a highly advanced surveillance network, including his past life as Sean McCaffrey. Dan takes the family to Paris to his old childhood home, which is also the base of his father's network, intending to destroy it. Finn arrives at the house under the former butler Vikram's care and activates the network.
In Paris, the Morgans seek help from Svetlana Romanova, Dan's former Russian intelligence contact, and hide at her place. Dan and Finn meet at a museum; Dan tries to reason with Finn. Finn admits he hates Dan because he was his father's favorite, and McCaffrey knew Finn was his son but didn't acknowledge him, abandoning him. Finn wants their late father's inheritance, so Dan warns him to stay away from his family. Finn then places a bounty and hires assassins to kill Dan.
After spending a day as a family together, Sveltana drugged Dan to collect the bounty, but she shows sympathy for him and his family, so she warns them that assassins are coming to kill them, and the Morgans and Omar escape from the assassins in a car chase. Dan devises a plan to get inside his home and sabotage the network; Dan and Omar will infiltrate through the rooftops and disable the security so Dan can get inside and use a flash drive created by Kyle to infect the servers and destroy the network; Nina and some of her colleagues start a protest outside to distract Finn; and Jessica stays with Kyle to upload the virus.
Finn predicts and captures Dan, but Vikram, loyal to Dan, lets him escape. Dan fights and defeats the assassins. Jessica connects the flash drive, and Kyle uploads a virus that destroys Finn's servers and funds. Furious, Finn fights Dan, but Dan defeats and subdues him. Jessica and the Morgans defeat the remaining assassins. French police arrest the Morgans and Finn, but Omar and his father, the Secretary General of Interpol, arrive to clear their charges.
Eleven months later, the Morgans moved to Columbus, Ohio, and Dan finally acknowledged Omar as a part of the family. Kyle has moved out to college, and Nina has started a new green company. Dan visits Finn in prison to make amends.
