This was probably my favourite book out of the entire series. It's great. It's set between Prelude to Foundation and Foundation, and serves as an excellent bridge between the two books. The book provides a characterized version of Hari Seldon, which I felt was missing in the other books, where the only place where readers would 'see' Hari Seldon would be at the Vault during the crises. In addition, while retaining a high level of excitment and plot-development, it made psychohistory come to life as a science, instead of just the as a mysetrious force as portrayed in the other books of the series. I recommend reading this book in its correct place in the series.