Uncovers the hidden networks behind Catholic publishing in Restoration London, where politics, religion, and print intersected in unexpected ways under Charles II, James VII/II, and Queen Catherine of Braganza. In the politically volatile decades following the Restoration, the Catholic book trade in London remained a vibrant and adaptive force. This study reconstructs the networks-commercial, familial, and religious-that sustained the production and circulation of Catholic texts between 1660 and 1688. These networks operated within and across confessional boundaries, drawing in Protestants and Catholics alike, and were shaped by shifting legal frameworks, urban patronage, and the ambiguities of what constituted a 'popish' text. Focusing on the lived experience of printers, booksellers, and readers, the book challenges the notion of Catholic isolation in Protestant England. It reveals how Catholic print culture was embedded in the broader English print economy and public sphere, often sharing tools, spaces, and strategies with dissenting and loyalist traditions. From Somerset House to the streets of London, Catholic actors navigated censorship and suspicion with ingenuity, contributing to a paradoxical print culture that was both illicit and integrated. Engaging with the fields of Catholic history, book history, and Restoration studies, this monograph offers a new framework for understanding religious identity, toleration, and the mechanics of clandestine publishing. It brings to light the agency of overlooked figures and repositions Catholic print as a central, rather than marginal, feature of early modern English society.