Nicolas Freeling’s Gadget is a book about a terrorist nuclear weapon. It can sort of be described as Red Army (villains win) meets The Sum of All Fears (nuclear terrorism). Only without the strong points of ether and with the latter’s weaknesses.
See, if you really, really loved the scenes in Fears where the nuclear bomb is being constructed, you will like this book. In fact, if the editor had chopped the entirety of that novel down to just the bomb construction scenes and ended the book right when it was successfully brought to the target and detonated, you’d have something very much like Gadget-a dry, technical nuclear tale.
I’ve pondered before why most nuclear terrorism novels were the way they were. The reason is “because it’s more dramatic than this”. If you absolutely need a detailed Herman Melville’s Nuclear Bomb story, this is the book for you. Otherwise, stay away.