The Christian son of Hamas leader

Mathew Kaminski:

'I absolutely know that in anybody's eyes I was a traitor," says Mosab Hassan Yousef. "To my family, to my nation, to my God. I crossed all the red lines in my society. I didn't leave one that I didn't cross."

Now 32, Mosab is the son of Sheikh Hassan Yousef, a founder and leader of the Palestinian terrorist group Hamas. Throughout the last decade, from the second Intifada to the current stalemate, he worked alongside his father in the West Bank. During that time the younger Mr. Yousef also secretly embraced Christianity. And as he reveals in his book "Son of Hamas," out this week, he became one of the top spies for Israel's internal security arm, the Shin Bet.

The news of this double conversion has sent ripples through the Middle East. One of Mr. Yousef's handlers at the Shin Bet confirmed his account to the Israeli daily Haaretz. Hamas—already reeling from the assassination of a senior military chief in Dubai in January—calls his claims Zionist propaganda. From the Israeli prison he has occupied since 2005, Sheikh Yousef on Monday issued a statement that he and his family "have completely disowned the man who was our oldest son and who is called Mosab."

For the past two years, Mosab Yousef has lived near San Diego, where he's kept a low profile out of concern for his security. The U.S. is currently weighing his application for political asylum, and until his confession to espionage and the publicity blitz that accompanied it this week, only knew him as the son of a terrorist who sometimes attends evangelical churches in California. The book is intended to launch a new life in America.

Mr. Yousef, whose large, engaging eyes sit prominently on an oval face, says he was confused for many years himself, and realizes many people will be as well. His family has been shamed and old friends refuse to believe him. The book, a Le Carréesque thriller wrapped in a spiritual coming-of-age story, is an attempt to answer what he says "is impossible to imagine"—"how I ended up working for my enemies who hurt me, who hurt my dad, who hurt my people."

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Mr. Yousef traces his awakening to his first sustained exposure to Hamas cruelty. In 1996, he was arrested by the Israelis for buying weapons. He says he was beaten and tortured badly in custody. It was then that the Shin Bet approached him. He says he thought about becoming a double agent. "I wanted revenge on Israel," he writes. But when he was sent to serve his term at the Megiddo prison in northern Israel, he says he was more shocked by the way the maj'd, Hamas's security wing, dealt with other prisoners.

"Every day, there was screaming; every night, torture. Hamas was torturing its own people!" he writes. The Muslims he met in jail "bore no resemblance to my father" and "were mean and petty . . . bigots and hypocrites."

By agreeing to work with the Shin Bet, he got out of prison early. He says he was curious about the Israelis and fast abandoned his idea to become a double agent. Though he took money from Shin Bet and stayed on their payroll for a decade, his handlers in the early years didn't ask much of him. They encouraged him to study and be a model son. His code name was the Green Prince: green as in the color of the Islamist Hamas flag, and prince as the offspring to Hamas royalty.

During those quiet years he met a British cabbie in Jerusalem who gave him an English-Arabic copy of the New Testament and invited him to attend a bible study session at their hotel. "I found that I was really drawn to the grace, love and humility that Jesus talked about," he says in "Son of Hamas."

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There is more.

He is an interesting guy. It is unfortunate that there are not more like him among the Palestinians. The question is whether or not they have to change their religious beliefs b efore they get reasonable.