To my knowledge there are 3 Missions. The last one dabble in the Atzlan-Horizon conflict.
And there is the Twilight Horizon Sourcebook, full with info’s about the inner working of Horizon, how this AAA is changing and why. In addition there are some scenarios around Horizon and their troubles.
S.44ff
“Technomancer Uprising”, “Friends in the Right Places” and “The Heart of the Head” are scenarios where the runner can support radical technomancers and their movement. There is even a funny layer penetration count*. And there are some fluff text about the riots but I did not found any ending.
As a runner you can see, and feel, the effects of the Spirit vs Horizon Arc in fluff text and some scenarios.
“The Breaking Point” (S.127) tries to handle the big blow up in Las Vegas but don’t finish any of the two stories. Yes you can stop a spirit in his plan to destroy the city, or not, but it neither end him nor the angry spirit union in the desert.
It`s not that I want everything told, in detail, with numbers and written down unchangeable for all time. I am just a little confused that they introduced 2 groups with the goal to destroy or break Horizon and gave them the power, plausibility and the means to achieve their goal. And now, from my point of view, there are 2 groups that could end Horizon, any time. The spirits just need another source of energy they can use and if the technomancer don’t have any lever after official penetrating multiple layers and installing don’t know how many backdoors into the horizon system, they better should go back in the kindergarten.
*Whenever some IT Security guy starts to talk about how many layers of Security they build up to secure their stuff, I just have to smile. Same with some scrip kiddy describing how they penetrated dozen layers of security.
Most successful hacks, thefts and such like only overcome one or two obstacles, some times none, to achieve their goals.