This paper examines the identity of Eva Bloch, credited as the translator of L’Immortalité (1990), the French version of Nesmrtelnost by Milan Kundera. Beyond this single translation, no trace of Bloch can be found in bibliographic or archival records. Given Kundera’s well-known tendency to closely supervise and revise translations of his works, many scholars have suggested that Eva Bloch may have been a pseudonym and that L’Immortalité represents Kundera’s first attempt at a self-translation into French.

Because archival sources remain inaccessible, the paper approaches this question through stylometric analysis. While authorship attribution of original texts has proven methodologically robust, identifying a translator presents additional challenges, particularly in cases where authorial intervention in the translation process was substantial. Building on recent research in translator authorship attribution, the study employs the stylo package in R to compare L’Immortalité with Kundera’s acknowledged French-language novels and essays, as well as with French translations of his Czech works by other translators.

The analysis combines cluster- and distance-based methods based on the distribution of the most frequent words with selected measures of stylistic complexity, including length-controlled lexical diversity, average sentence length, and bi-gram entropy. The aim is to determine whether L’Immortalité aligns stylistically with Kundera’s later French works, with known translators, or suggests a more collaborative authorship. The case thus serves both as a test of the pseudonym hypothesis and as an experiment in applying stylometry to the complex process of literary translation.