Sally Rooney's books are not banned in Britain. They are simply unavailable, unorderable, and vanishing from shelves — the practical difference between a ban and a legal squeeze is narrowing fast. Faber's decision to stop supplying her work follows from a single, blunt legal reality: passing UK earnings to an author who has publicly declared support for a proscribed organisation exposes the publisher to criminal liability under the Terrorism Act, with sentences of up to 14 years. Faber did not act under duress in the crude sense — Rooney agreed — but the structural coercion is obvious. Nielsen BookScan recorded 4,531 Rooney copies sold in the week following the announcement, a 291% spike from the prior week. Bookmarked in Bristol sold its three copies in hours. The Best of Times in Kent cannot reorder: Gardners, the UK's dominant book wholesaler, has every Rooney title marked unavailable. The shop can, however, order four editions of Mein Kampf. That contrast is not rhetorical flourish — it is an accurate description of which books the current legal architecture protects and which it suppresses. The enforcement logic is revealing. Palestine Action was proscribed as a terrorist organisation in July 2025. The High Court ruled the proscription unlawful in February; the Court of Appeal overturned that ruling in June, reinstating the ban. Rooney had already said in August 2025 that she could no longer safely travel to the UK without risking arrest. Her editor collected a recent award in London on her behalf. The Terrorism Act is doing something its architects may not have intended: it is functionally prohibiting a major literary novelist from operating in the British market. The supply chain has rerouted almost overnight. Kennys Bookshop in Galway reports Rooney sales up tenfold, with 95% of new buyers coming from Britain. Bridge Books in Co Down — straddling the UK and Irish markets via Brexit's asymmetric arrangements — is posting copies across the water after openly announcing it would continue to stock her. Northern Ireland has become a literary grey market corridor. The irony is not lost on Tómas Kenny, who grew up in an Ireland where books were banned for blasphemy and Britain was the escape route. The direction of travel has inverted. The Terrorism Act's breadth is the structural story here. Index on Censorship's Jemimah Steinfeld notes that proscribing Palestine Action 'highlighted that the Terrorism Act is too broad in structure and application' — the arrests of thousands of peaceful protesters that followed made that point empirically. A law architected to disrupt violent networks is now disrupting publishing supply chains, author travel, and bookseller livelihoods. The friction is not confined to Rooney: independent shops that depend on marquee authors for annual revenue are staring at an unresolvable stock problem. The political dimension is accelerating. Ireland's Foreign Affairs Minister Helen McEntee has said she will raise the issue directly with UK Foreign Secretary Ed Miliband. An open letter signed by Zadie Smith, Annie Ernaux, Naomi Klein, and new Nobel laureate Anne Carson declares 'Sally Rooney is a writer, not a terrorist.' Paul Mescal, Daisy Edgar-Jones, and Gary Lineker are also signatories. The letter's framing is legally precise: the problem is not Rooney's politics but the instrument being used to punish them. The real test, as Kenny identifies it, is the next Rooney novel — likely not far away. Intermezzo was published two years ago. When a new book arrives, will Faber publish it in the UK at all? Will British readers be able to buy it at launch, or will they order from Galway? That question determines whether this episode is a temporary legal anomaly or the opening chapter of a durable market partition — one where British literary culture increasingly diverges from Irish and European supply chains because of a counterterrorism statute.