There are books about impeachment that are relevant today. I’ve already suggested that you have a look at Impeachment: An American History by Jon Meacham, Peter Baker, Tim Naftali, and Jefrey Engel. I also noted that the newest edition of “Impeachment: A Handbook” is out.
And now, there is a new volume:
For the third time in forty-five years, America is talking about impeaching a president, but the impeachment provisions of the American constitution are widely misunderstood. In High Crimes and Misdemeanors, constitutional scholar Frank O. Bowman, III offers unprecedented clarity to the question of impeachment, tracing its roots to medieval England through its adoption in the Constitution and 250 years of American experience. By examining the human and political history of those who have faced impeachment, Bowman demonstrates that the Framers intended impeachment to be a flexible tool, adaptable to the needs of any age. Written in a lively, engaging style, the book combines a deep historical and constitutional analysis of the impeachment clauses, a coherent theory of when impeachment should be used to protect constitutional order against presidential misconduct, and a comprehensive presentation of the case for and against impeachment of President Trump. It is an indispensable work for the present moment.