The “classic” conversion account would be “Apologia Pro Vita Sua” (“An explanation of my life” - the title is Latin but the book is in English) by John Henry Cardinal Newman, who was a highly respected Anglican clergyman who “defected” to Rome. This book is VERY intellectual, however (I found it tedious - though rewarding - reading, even though I regard myself as an intellegent intellectual sort of guy).
Prehaps, though, it is not the best idea to hand him a book. Maybe a better approach would be to ask this person to identify the one particular Catholic doctrine that is most troubling to him. Because the Episcopal church is (superficially, at least) very similar to the Catholic Church. But there are distinctive “Catholic” beliefs that cannot be found within Anglicanism. Ask him to pick his “main” gripe and show why the Episcopal church is correct about it.
For me (a former Episcolpalean whose dad was an Episcopal priest), the “main” issue was the Papacy - I found I could not disprove the Church’s position about this doctrine, and I was thus essentially “forced” to become Catholic. His “gripe” may be something different, but whatever it is, if he looks into it with an honest and open heart, he will see that the truth of the matter favors Rome, and once he comes to that conclusion, where else can he go?