Sollecito's ‘Honor Bound’ tells his side of the romance with Amanda Knox and tragic, bizarre night of roommate Meredith Kercher’s murder.

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Raffaele Sollecito and Amanda Knox kissing.

Raffaele Sollecito has written a book about his romance with Amanda Knox during the murder case that made headlines worldwide.

In 2009, Sollecito and then-girlfriend Knox were convicted of killing Knox's roommate Meredith Kercher in in Perugia, Italy two years earlier. The couple served four years in prison before their release in October on lack of evidence.

Sollecito's upcoming book, "Honor Bound: My Journey to Hell and Back with Amanda Knox" details the beginning of his relationship with Knox and the murder case that put them in the international spotlight.

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Throughout the book, co-written by Andrew Gumbel, Sollecito maintains the couple's innocence but admits that their behavior was bizarre, reports The Associated Press.

After Kercher's murder, Knox shopped for lingerie and performed cartwheels in front of investigators. The couple also kissed and caressed each other outside the murder scene as police inspected inside. Sollecito and Knox were unaware that news cameras were recording their actions.

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Sollecito’s upcoming book.

Knox claims in the book that the couple's memories of that night are hazy because they reportedly smoked marijuana. Sollecito claimed they had no "real alibi the night of November 1 except each other."

Their weird behavior prompted suspicion from the authorities, resulting in prison sentences of 26 years for Knox and 25 for Sollecito. His first night in prison, Sollecito wrote that he experienced "great waves of indignation and a nagging sense of guilt."

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Sollecito since being released from prison.

After their release, he said he felt "indescribable joy," according to the Associated Press.

Rudy Guede, a drug dealer from Côte d'Ivoire, is currently serving a 16-year sentence for the sexual assault and murder of Kercher.

Simon & Schuster will publish "Honor Bound" on Sept. 18. Knox signed a $4 million book deal with HarperCollins for her side of the story. It is scheduled for a spring release.

mwalsh@nydailynews.com

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