
Mission 73 lays bare the grief driving Billy Squire while the crisis races toward catastrophe. Yuri's squad frees the second bus by force, the SSS prepares a night assault, and Anya, hearing Vadim plan to blow up every hostage, rises from her seat to intervene.
A flashback opens on a younger Billy Squire arguing with his daughter Biddy over her plan to attend a Red Circus protest. He distrusts the organization and fears what a government hostile to dissent will do to her; she answers that dying for her convictions frightens her less than a life where criticizing wrongdoing is forbidden. His plea about protecting their family goes unheeded. The protest's aftermath leaves him standing over her body. Marked by the SSS simply for being her father, he escapes the country with the Red Circus's help. In the present, Anya has absorbed all of it, having read the memories the children stirred up in him.
Tired of waiting, Vadim proposes activating Bruce and the second bus, the group's hidden trump card, protected until now by strict radio silence. That card is already lost. At the warehouse, SSS observers count the men inside and time their strike, and a gas-masked team including Yuri moves in with tear gas. Two agents die in the opening exchange, but the raid succeeds: Yuri personally beats down Bruce, taking a bullet in the shoulder and answering it with a knee strike born of disgust at a man hiding behind children. The hostages come out safe. Yuri, whose pain tolerance collapses whenever his motivation does, howls about suffering all this for Anya of all people.
Command of the main standoff passes from the frustrated police chief to the SSS captain, who announces to the bus that the second cell is dead and gives the hijackers until dawn to surrender. Vadim erupts; Billy quietly concedes failure. Though Vadim invokes their fallen friends, the dream of rebuilding the Red Circus, and Billy's own daughter, he privately concludes the man is too broken to rely on and settles on a final option: detonate the bus, hostages included, timed to catch the assault team in the blast.
Anya hears every word of the plan, along with the kill-ready thoughts of the SSS guard regiment massing outside. The captain, done negotiating, orders a storm under cover of night despite his own dawn deadline. Knowing what awaits the moment the raid begins, Anya stands up and fixes her eyes on Billy Squire, stunning her classmates.
A flashback reveals Biddy Squire died in the crackdown on a Red Circus protest, and that her death is what radicalized Billy.
Yuri's SSS squad raids the warehouse, kills the second cell, defeats Bruce, and rescues every hostage on the second bus; Yuri is shot in the shoulder.
The SSS captain takes command from the police chief and issues a surrender ultimatum, then secretly orders a night assault.
Vadim resolves to blow up the bus with everyone aboard as a last resort, and Anya overhears the plan telepathically.
Anya rises to confront Billy as the strike force closes in.

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Mission 73 is a 16-page Volume 11 chapter, released December 26, 2022, in the Bus Hijacking Arc and adapted in Episode 45. Billy and Biddy Squire share the cover, and the chapter marks Bruce's death.
The SSS guard regiment's uniforms appear modeled on the Diensteinheit IX, a covert East German counter-terrorism unit active from the 1970s through the 1990s.
Biddy Squire was Billy Squire's daughter, shown in a Chapter 73 flashback arguing with her father before attending a Red Circus protest. She was killed in the government's violent crackdown on the demonstration, an event that radicalized Billy.
In Chapter 73, an SSS squad including Yuri Briar raids the warehouse hiding the second bus, using tear gas to overwhelm the hijackers. Yuri personally defeats Bruce and is shot in the shoulder, but every hostage on the second bus is rescued safely.
After the SSS captain issues a surrender ultimatum in Chapter 73, Vadim decides Billy is too broken to rely on and resolves to detonate the bus with all the hostages aboard, timing it to catch the incoming assault team. Anya overhears the entire plan telepathically.
In Chapter 73, the SSS captain takes command from the frustrated police chief, publicly gives the hijackers until dawn to surrender, and secretly orders a night assault on the bus. Anya senses the guard regiment's kill-ready thoughts massing outside.
Realizing what will happen the moment the SSS assault begins, Anya Forger stands up in Chapter 73 and fixes her eyes on Billy Squire, stunning her classmates. Her intervention sets up the confrontation that follows in the next chapter.
Looking for more on Chapter 73? The Spy x Family Wiki on Fandom has a dedicated page with community notes.
View on FandomThis content is original writing by Daddy Jim Headquarters based on the Spy x Family anime series, manga, and official materials. Spy x Family was created by Tatsuya Endo, published by Shueisha, and animated by Wit Studio and CloverWorks. All rights to Spy x Family and its characters belong to their respective owners. Episode and chapter references are cited where applicable.
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