Plot

A woman returns from combat and befriends a family in NYC. A gang of thieves plot to take the family's valuables, and she is all that stands between them and their lives.

In this punishing action-thriller starring Ruby Rose (John Wick: Chapter 2), a former Marine turned doorman at a luxury New York City high-rise must outsmart and battle a group of art thieves and their ruthless leader (Jean Reno, Léon: The Professional) - while struggling to protect her sister's family. As the thieves become increasingly desperate and violent, the doorman calls upon her deadly fighting skills to end the showdown.

In Bucharest, U.S. Marine Gunnery Sergeant Alexandra "Ali" Gorski is tasked to protect a convoy carrying the daughter of the ambassador. Armed mercenaries ambush them, and although Ali fights fiercely and effectively, the mercenaries are still able to kill the ambassador, his wife and their daughter. Ali leaves the Marines and returns to New York City. Her uncle, Pat, tells her of a job in The Carrington Hotel in New York City where he works. Ali is hired, working alongside another doorman, Borz. She finds out that her late sister's husband, Jon Stanton, a professor, and his two children, Max and Lily, live there. Jon and Ali have previous history together. She is invited to their Easter dinner.

Over the Easter holiday, Ali's uncle, Pat, is killed by Borz with a sledgehammer, revealing that Borz has been disguised as a doorman to search for valuable paintings hidden in the hotel. A group of mercenaries led by Victor Dubois arrive and initiate a lock down. Dubois, Borz, and his men invade the apartment of Bernard Hersch, who is suffering from akinetic mutism. Dubois knew Bernard as Erich Dreischler and asks where the paintings are. When Bernard does not speak, Borz stabs him in the hand, finally bringing Bernard around, even though he cannot recall the whereabouts of the paintings. When Bernard's wife explains that seven years earlier, they moved from Room 10C, which is now occupied by the Stantons, the mercenaries leave for 10C, and Borz kills Bernard and his wife.

Dubois and his men arrive at 10C and hold Jon and Lily hostage, while Max, seeing the men already inside, runs away. Dubois eventually discovers the hidden safe containing the paintings and has Martinez use a water cooled drill to bypass the combination code. Jon attempts to distract Dubois by having a glass of wine to allow Lily to use Dubois' laptop to call for help via Facebook but Borz catches her and Dubois forces her to delete the message.

After discovering the Hersch couple's corpse and Borz's betrayal, Ali kills one henchman and runs into Max. Ali and Max activate the fire alarm to summon the fire department but as Ali tries to alert them, two other henchmen catch the two and the firefighters find nothing amiss and leave after Borz explains that it was the false alarm. After Ali kills another, Max is separated and is recaptured and brought to the room. Dubois calls Ali via the PA system, ordering her to surrender herself. Seeing the water hose is connecting to the drill bit, Max surreptitiously uses the PA system as a Morse code to message Ali to disable the main valve of the water supply. Leo is killed by the nail bomb set by Ali while attempting to turn the water back on, destroying the main valve as well. Dubois radios her and threatens to kill the family if Ali refuses to restore the water supply. Ali agrees and, with corrupt NYPD officer Olsen (Dubois' cohort) at gunpoint, connects the hose from the rooftop water tank. The safe is opened, revealing the paintings. After realizing their true value the mercenaries agree that 50% of the proceeds will go to Dubois while the remaining men, Martinez and Borz, will only receive a share of 25%. Ali then kills Olsen and rushes to the room where she holds Martinez hostage. Borz injures Jon and kills Martinez to increase his share to 50%.

As the police arrive at the scene, Borz dresses as a doorman to walk past the police and pins the blame on Ali, who incapacitates the officers and chases Borz. As they walk through the sewer, Borz turns on Dubois and kills him. Ali fights Borz and finally kills him with a grenade. Sometime later, Ali bids farewell to Jon and his children, who are heading to London.

(copied from Wikipedia)