You can read all about Cranmer’s interrogation, and the results of it, in my article 8 November 1541 – Catherine Howard Confesses to Archbishop Cranmer.
If you’re interested in reading more on Catherine, her life and her fall, then I would recommend the following books:
- Katherine Howard: A New History by Conor Byrne
- Catherine Howard by Lacey Baldwin Smith
- Six Wives: The Queens of Henry VIII by David Starkey