San Francisco, 1878. Ah Sahm, a newly arrived Chinese immigrant with serious fighting skills, is introduced to Chinatown's most ruthless tong, the Hop Wei, by Chao, a fixer. After impressing Young Jun, son of tong leader Father Jun, Ah Sahm is branded and taken to a brothel, where he befriends Ah Toy, a courtesan with connections. Later, in search of a woman who left China two years earlier, Ah Sahm crosses paths with Mai Ling and Li Yong, followers of the rival tong leader Long Zii, who is trying to avoid an opium war with the Hop Wei, a war that Walter Buckley, deputy to San Francisco Mayor Samuel Blake, actively promotes. Meanwhile, after two Chinese laborers are killed by white thugs, police sergeant "Big Bill" O'Hara is tasked with creating a Chinatown squad. Enlisting southern-born cop Richard Henry Lee, Bill soon finds that the hostility between the Chinese and white dock workers, whose unofficial leader is Irish tough Dylan Leary, is unlikely to end anytime soon.

Intercepting a shipment of opium at the docks, Young Jun, with Ah Sahm and his Hop Wei lieutenant Bolo in tow, decides to send a message to Long Zii. Big Bill and Lee investigate a grisly murder scene in an alley next to an Irish bar, The Banshee. Penny Blake, the young wife of San Francisco's mayor, finds herself in a bind while visiting the wharf with her Chinese manservant, Jacob. Ah Sahm pays a steep price for playing the hero. The Long Zii clean up a mess, and brace for more bloodshed.

Big Bill discovers a possible solution to his gambling excesses; Penny reveals the circumstances that prompted her to marry Mayor Blake; Mai Ling offers Ah Sahm a way out of a protracted and bloody tong war.

Tensions escalate between the Hop Wei and Long Zii after an assassination attempt; Big Bill sets out to pay his debt to Jack; Blake and Buckley get a mandate from Robert Crestwood.

Father Jun sends Bolo to hunt down Long Zii and Mai Ling; Penny is faced with an unsavory choice; Lee's past catches up with him.

After a bloodbath, the Hop Wei and Long Zii consider a novel way to end hostilities; Ah Toy and her business partner hit a fork in the road; Mai Ling warns her brother against waging a battle he may not win.

Chinatown gathers to witness a "prize fight" between elite warriors from the Hop Wei and Long Zii. Buckley plays a bluff in hopes of getting Mercer to lower his fee. Ah Sahm remembers his roots as a fighter, as Ah Toy warns him of the dangers that await. Bill and Lee question Wang Chao about the recent series of sword killings in San Francisco.

Ah Sahm rejects his warrior roots; Leary pays a violent visit to Mercer.

[Cinemax] HD. 'Learn to Endure, or Hire a Bodyguard.' Season 2 Premiere. Ah Sahm takes on new fights; Mai Ling worries about the threat he may pose.

[Cinemax] HD. 'The Chinese Connection.' (Season 2) Ah Sahm and Young Jun pursue a secretive deal. Penny looks for protection. Mai Ling sends a message.

Ah Sahm and Young Jun meet a curious recruit. Chao and Mai Ling both have encounters with Zing.

Ah Sahm's scheme to protect Penny's factory while serving his own covert Hop Wei agenda seems to be working well, but Leary has other plans for the factory that will change things drastically.

Penny finds her business in trouble. Leary gets a warning. Bill and Chao put their plot into action.

Change is afoot for the Hop Wei after Father Jun, Ah Sahm, and Young Jun face off. Ah Toy decides that Nellie may be the answer to her problems and takes matters at a sadistic rival brothel into her own hands. Leary is urged by both Buckley and Sophie to utilize his political influence. Just as his heroics are trumpeted, Bill is faced with another swordsman murder. A fatal clash unfolds at the Blake household.

[Cinemax] HD. 'All Enemies, Foreign and Domestic.' (Season 2) In search of a killer, the police shut down Chinatown. Buckley steps into a new role.

[Cinemax] HD. 'Enter the Dragon.' (Season 2) Enemies become allies when chaos erupts in Chinatown.

Struggling under the pressure of an increased police presence, the Hop Wei search for a new way to survive. Meanwhile, as Leary grows frustrated with his limitations on the city council, the Long Zii gain powerful new connections.

As Ah Sahm and Young Jun struggle to produce authentic bills, they get valuable printing advice from an unexpected source. Meanwhile, the Secret Service begins to track counterfeit currency and Mai Ling mingles with a new crowd.

While taking menacing steps to secure Nellie's land, Strickland instills confidence in Leary's political abilities. Then, as the Hop Wei increase bill production, tensions rise between Young Jim and Ah Sahm.

Shaken by the loss of Nellie's land, Ah Toy grapples with a difficult choice. While Mai Ling strikes a business deal with Eliza, an intrusive encounter echoes Li Yong's fears. Ah Sahm and Yan Mi think on their toes during a police raid.

Ah Sahm and Hong race against time to free Young Jun before he's sent to China. As Mai Ling hits rock bottom in prison, Li Yong struggles to gain support for a rescue mission. Buckley raises an ultimatum, and Lee follows his instincts.

In the wake of Father Jun's injury, Young Jun steps up for the Hop Wei. As Leary struggles to smooth over rising working-class tensions, Ah Sahm grapples with revelations from Yan Mi and Mai Ling.

As Mai Ling's wedding briefly unites the Hop Wei and Long Zii, Li Yong receives a grim final warning from Kong Pak. Meanwhile, Mosley and Lee further their investigation, Buckley reaps the benefits, and Bill reasserts his dominance.

Ah Sahm makes a bold sacrifice to protect Yan Mi, Mai Ling reckons with the consequences of her actions, and Leary reaches his breaking point after a shocking blow from Strickland.

As the Secret Service finaly corner the Tongs' printing operation, Ah Sahm must choose between his brothers in the Hop Wei anda future with Yan Mi. Later, Young Jun seizes an opportunity to hit the Long Zii where it hurts.