A plaintiffs lawyer whose career was upended over his communications with a criminally indicted former Willkie Farr & Gallagher partner is writing what he called a “deeply personal memoir” about “friendship and betrayal” related to the still-evolving drama.

Attorney Gary B. Friedman, in court papers filed Tuesday, is promising a book “with a wide sweep” that uses, among other sources, thousands of pages of emails and documents from credit card litigation pending in the Eastern District of New York.