PARIS (AP) — Former French President Nicolas Sarkozy described the prison where he spent 20 days as a noisy, harsh “all-grey” world of “inhuman violence” in a book released Wednesday that also offered political advice about how his conservative party should appeal to far-right voters.

In “Diary of a Prisoner,” the 70-year-old says his own tough-on-crime stance has taken on a new perspective as he recounts the uncommon turn in his life after being found guilty of criminal association in financing his winning 2007 campaign with funds from Libya.

The court sentenced him in September to five years in prison, a ruling he appealed. He was granted release under judicial supervision after 20 days behind bars.

The book provides a rare look inside Paris’ La Santé prison, where Sarkozy was held in

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