The eleventh- or twelfth-century parchment codex 170/347 is one of the rarities archived in the UCLA Young Research Library Special Collections. It has much to offer to a student of paleography: illuminations, a scribe’s colophon, calligraphic minuscule script, later inscriptions and modifications, inserted paper quires, missing folia, study notes, and even a cryptographic table. One of the most fascinating aspects of this New-Testament-turned-lectionary manuscript, however, is its history as a world traveler, for the most part incognito. Although the manuscript’s mysterious disappearance from St. Catherine’s metochion in Cairo obscured its trajectory, the analysis of its graffiti and the comparison of catalogs’ data help reestablish its provenance and narrate its journey beyond the walls of a monastic scriptorium. The resulting travelogue not only tells the story of how Sinai-born MS 170/347 landed in Los Angeles; it offers insight into the fate that befell many other rare books in the height of the nineteenth-century collecting and scholarship rush.