This is AH's second foray into the world of James Bond. Like practically anything written by him, this is an enjoyable read that romps through all the usual Bond tropes, with a couple of twists thrown in. One of the early twists caught me unawares - me! someone who suspiciously watches out for twists and engineered surprises.
I don't have much negative to say about Forever and a Day. Maybe Bond is a bit passive. Things happen about him, and he seems rather inefficient at times. But even Fleming wrote Bond like that, Casino Royale being the obvious example. And maybe there was a tad too much introspection on the part of a couple of the characters.
Minor blips only. If you are a Bond fan, you won't find this Horowitz addition to the franchise disappointing you.