Eagle of the Ninth

This is one of my favorite books of all time. Even rereading it I was just as engaged and excited. I am obsessed with Roman history and bromance. This book has both. This book is the best of both. The brotherly dynamic between Marcus and Esca is one of my favorite things in any book I've ever read. The Roman history is spot on without being bleak, which is hard to find in this genre. Rosemary Sutcliff is the queen of historic fiction.
And if you love this book you should immediately read the Silver Branch, it dovetails nicely with this book and makes many references back to it.