The disclosure of serial plagiarism in the extensive theological and journalistic publications of Thomas Rosica, CSB, former Vatican spokesperson and sometime media attaché of the Holy See Press Office, attracted significant media attention in early 2019. This article examines a selection of Rosica's hidden sources, focusing on how passages from magisterial church documents appear without attribution in his theological works. Our examination of this unusual case of plagiarism highlights important facets of authorship and authority in the practice of theology as well as the key role of attestation in magisterial teaching.