This article, which was substantively complete at the time of Professor Lyne's sad death, takes a close look at Horace Epodes 13. Lyne displays the complex intertextual and generic resonances of the poem, which is crossed between iambic and lyric ancestry. The poem also functions as a major structural element in the book of Epodes, since it appears to signal a closure which does not happen, and which is wittily picked up in the following poem's apology to Maecenas for the poet's inability to finish the book. This play with finishing, and with iambic books of 13 or 17 poems in length, alludes to Callimachus and his book of Iambi. The closural elements in Epode 13 resonate which similar closurality in Iambus XIII, and the continuation in Epodes 14–17 is Horace's reflection on the puzzle about whether Iambus XIII represents closure ‘followed by heterogeneous material [filled out either by Callimachus himself or by a copyist] or “false closure” followed by more Iambi’.