Author of new royal tell-all 'Battle of Brothers' gives 1st US interview

Royal historian Robert Lacey discusses his new book about Prince William and Prince Harry, the latter who he contends took meeting Meghan as a chance to break free from his role.
3:34 | 10/19/20

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Transcript for Author of new royal tell-all 'Battle of Brothers' gives 1st US interview
We are back now with that ABC news exclusive. The author of the new book "Battle of brothers" and consultant for Netflix's hit show "The crown" giving us his first TV interview. Maggie Rulli joins us with more on all of that. Good morning, Maggie. Reporter: Hey, Amy. Good morning. The book says that rift is more like a sibling rivalry on Harry and Meghan seem to be moving forward but even an ocean and a country cannot keep them away from this royal drama. In the new book "Battle of brothers" royal historian Robert Lacey paints a bleak picture of two young men struggling with the demons of their part. Two princes pitted against each other from the start. So many stories out right now focused on Meghan and megxit but based on your book it seems like this rift happened quite sometime ago. It goes back to the beginning when they were children and at the age of 6, 7, William suddenly starts becoming more serious. He's aware of his destiny as a king. Harry goes in the opposite direction. Do you think William set Harry up to fail. There is a sense, I think, in which William could be criticized for setting Harry up to fail T suited the elder brother so well to have the court jester, to have the guy who always carried the blame. Both when they were teenagers and now. Reporter: Lacey contends Harry was increasingly unhappy in this role so when he met Meghan he took the chance to break free. He falls in love with this megawatt woman. He is inspired and transformed by her and he wants more than that. And the pals couldn't handle it. Do you think Meghan was treated unfairly by the palace. I think frankly there is a clique that has in for her. They were megarock stars who for the first couple of years overshadowed William and Kate. Somehow they had to be edged out and I fear that that is the long-term solution that the palace sees. Reporter: The palace sending a message to Harry. Picture is issued of the four monarchs of the present and the future and I think the underlying message of that is just remember your place, Harry and Meghan. These are the people that really matter in the royal family and you are the backup and you're trying to play too prominent a role. Reporter: The battle between the brothers reaching fever pitch as Harry announces his plans to step down as a senior They explode and they publish their own plans which they've been planning to release after proper discussion, but Harry lost his cool, he put it out there. The royal family get about ten minutes app notice of what he's going to do so they lose their cool. William in particular loses his cool. Reporter: William refusing to even have lunch with Harry before the big meeting at the queen's sandringham estate last January where the couple's future was mapped out. Now living this California they have been speaking up on causes important to them without the constraints of the royal family. Lacey argues their departure was grossly mishandled by all and is a great loss to the monarchy. Well, the book is out tomorrow and so far there's been no comment from the palace. And as far as brother-in-law reunion is concerned Lacey thinks the responsibility is on William to reach out. Hopefully that will happen. Maggie, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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