First, I should check if I know anything about the book. "The Ex Vows" sounds like a romance novel—maybe a second-chance romance or a contemporary drama. Jessica Joyce might be an author with a specific style. I should consider themes like love, betrayal, personal growth, which are common in such books. Also, the user is interested in portable formats, so I need to address how the story works in EPUB or PDF. Are there any issues with formatting in these versions? Maybe accessibility features like adjustable fonts or text-to-speech compatibility?