Eight years after the dramatic takedown of the notorious crime lord Fouchet, Miami PD detectives Mike Lowrey and Marcus Burnett find themselves embroiled in a complex investigation into the illicit ecstasy trade thriving within the vibrant city of Miami. Their mission leads them to unexpected territory when they infiltrate a Klan meeting, only to uncover that the group is merely acting as buyers rather than the suppliers they initially thought. A communication blunder results in a delay for the city's Tactical Narcotics Team (TNT), forcing Mike and Marcus to engage in chaotic gunfire with the Klansmen, culminating in a comedic mishap where Mike accidentally shoots Marcus in the buttocks.
This reckless adventure intensifies Marcus' inner turmoil, as he grapples with his feelings about continuing his partnership with Mike. Complicating matters further, Mike has secretly begun dating Syd, the younger sister of Marcus. As the tension simmers, Marcus is on the verge of transferring out of the TNT Unit but is waiting for just the right moment to broach the news with Mike. Unbeknownst to both partners, Syd is embedded undercover with the DEA, posing as a money launderer tied to a branch of the Russian mafia that is heavily involved in Miami's drug operations. They are in cahoots with the dangerous drug lord, Hector Juan Carlos "Johnny" Tapia.
As the plot thickens, Syd finds herself in peril when a Haitian gang known as Zoe Pound converges upon her while she is in the midst of transporting a significant sum of laundered money. Mike and Marcus, working diligently on an insider tip, follow the movements of this gang, leading to a riveting sequence of violence marked by an explosive gun battle and an electrifying car chase through the bustling streets of Miami, culminating at the MacArthur Causeway. The aftermath draws the ire of Captain Howard, who is further aggravated upon discovering that the DEA had been investigating operations in his city without consultation.
Driven to unearth the truth, Mike and Marcus set out to track down the Haitians, interrogating their leader and leveraging footage from the gang's surveillance cameras to unveil that Tapia has ingeniously masked his drug operations beneath the façade of a local mortuary. To gather more pertinent information, the duo cleverly adopts the guise of pest exterminators attending to a supposed rat problem at Tapia's lavish estate. While these investigations unfold, Tapia cultivates a dangerously manipulative relationship with Syd, utilizing her to manage the substantial influx of cash connected to his nefarious dealings.
In a startling discovery inside the mortuary, Mike and Marcus uncover that Tapia employs cadavers and coffins as a clever ruse to transport drugs and money across borders undetected. The shocking evidence is more than enough to compel Captain Howard to coordinate a timely raid on both Tapia's residence and the mortuary, teaming up with the DEA and U.S. Coast Guard for a unified front against crime.
Following the operation, a hefty portion of Tapia's illicit drug stash and laundered wealth is successfully seized. Yet, the cunning drug lord manages to evade capture, escaping to Cuba with Syd as a hostage—having learned her true identity as a DEA agent during the mayhem of the raid. In a desperate gamble, Tapia demands his seized resources back within 48 hours, using Syd as leverage in a high-stakes game.
Determined to save Syd, Mike and Marcus swiftly assemble a covert team comprised of DEA agents, TNT operatives, and connections from Captain Howard’s network with the CIA. The Coast Guard facilitates their infiltration a few miles offshore from Cuba, allowing them to ally with fellow officer Vargas's brother, Tito, who leads a local underground resistance group named Alpha 66. Tito provides crucial support with firearms, access to a clandestine network of tunnels, and detailed schematics of Tapia's sprawling mansion.
The unfolding rescue mission leads Mike, Marcus, and their allies into a high-octane raid on Tapia's heavily fortified mansion. They successfully extract Syd while also planting a massive explosive device that obliterates the mansion upon their exit. In a harrowing escape aboard a stolen yellow Hummer H2, the group finds themselves pursued by Tapia, who has survived the chaos. The escalating situation intensifies as they approach the notorious Guantanamo Bay, where the Navy misidentifies both the pursuers and the pursued, resulting in a deadly encounter with crossfire that halts them just at the brink of a live minefield.
In a climactic showdown, Marcus bravely confronts Tapia, ultimately taking him down while he has Mike at gunpoint. In a macabre twist of fate, Tapia’s body spins back, landing onto a mine, leading to an explosive end for the criminal mastermind.
With the dust settling, Mike, Marcus, and Syd regroup to celebrate a victorious yet harrowing mission. They enjoy a heartfelt barbecue at Marcus's home, surrounded by family, with Marcus ultimately concluding to continue his partnership with Mike—reinforcing their bonds as both friends and colleagues amidst a city that never sleeps.
