Jim Cramer sits down with the man who broke the story about Theranos, Bad Blood author John Carreyrou.

Former Theranos CEO Elizabeth Holmes really believed that she was doing something positive for the world, author John Carreyrou told CNBC's Jim Cramer.

"She really did believe that creating this machine that would be able to run every test known to man off of just a pinprick of blood, that that would really be good for society and that it would do good," Carreyrou told the Mad Money host. "So I think she has this condition called noble cause corruption, which is that she ultimately believed that what she was going to achieve once she got there was gonna be a good thing for humanity. Therefore, every lie and every corner she cut along the way was justified."

Carreyrou's book "Bad Blood" tackles the rise and fall of Theranos and Holmes, its founder. The Silicon Valley darling, at one time valued at $9 billion, claimed that it only needed a microscopic amount of blood for its automated blood tests. Through his reporting in the Wall Street Journal, Carreyrou found that the technology did not work as promised, and that the biotech company misled customers about the methodology and accuracy of its tests.
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Bad Blood Author Carreyrou On Elizabeth Holmes And Theranos | CNBC