This paper deals with the 24-line mythological epyllion Progne et Philomela (Anth. Lat. 13 R), an anonymous Virgilian cento of presumed North African origin, which is usually dated to the fourth or fifth century and is marked by considerable obscurity. The aim is to shed some light on the most intriguing parts of this elliptical retelling of the given myth, in particular the puzzling network of family relationships and the extended talking-blood metaphor. Offering a new perspective on the text, the author claims that its general ambiguity is, to some extent, a purposefully adopted authorial strategy rather than a by-product of the cento technique. For this reason, it is proposed that the poem might have been written as a sort of mythological riddle to be solved by its readers.