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We focus on the exceptional flaring activity of 3C 454.3 in November 2010 andwe discuss a theoretical framework addressing all data in their overallevolution.  For two weeks the source has shown a plateau of enhanced GeV emissionpreceding a sudden major flare lasting about 3 days before decaying. Thegamma-ray flare onset is abrupt (about 6 hours), and is characterized by aprominent "Compton dominance" with the GeV flux exceeding the pre-flare valuesby a factor of 4-5, whereas the optical and X-ray fluxes increased only by afactor 2.  We explore two alternatives. Case 1, with high-energy emission originatingwithin the BLR; and Case 2, with most of it produced outside. We show that Case1 has considerable problems in explaining the whole set of multifrequency data.Case 2, instead, leads to a consistent and interesting interpretation based onthe enhanced inverse Compton radiation that is produced as the jet crashes ontoa mirror cloud positioned at few parsec from the BH. This model explains thegamma-ray vs. optical/X-ray behavior of 3C 454.3, including the otherwisepuzzling phenomena such as the prominent "orphan" optical flare, and theenhanced line emission with no appreciable gamma-ray counterpart that precededthe GeV flare. It also accounts for the delayed onset of the latter on top ofthe long plateau. Our modelling of the exceptional 3C 454.3 gamma-ray flareshows that, while emission inside the canonical BLR is problematic, major andrapid variations can be produced at parsec scales with moderate bulk Lorentzfactors $\Gamma\approx 15$.

The blob crashes into the mirror: modelling the exceptional gamma-ray flaring activity of 3C 454.3 in November 2010