"Ang Katipunan" is a historical book written by Francisco, GB (Gabriel Beato) that tells the story of an important phase of Philippine history - the days of the Katipunan. The author describes in detail the creation and development of a secret Filipino nationalist society at the end of the 19th century, which was key in the struggle for Philippine independence from the Spanish colonizers. The book immerses the reader in the atmosphere of the movement for freedom, revealing the dramatic events, intrigues and heroism of the fighters for the liberation of the country. "Ang Katipunan" is not only a historical narrative, but also a deep analytical work that helps to better understand the Filipino culture and the spirit of the nation.