I know how uncertain you can feel in these moments — an uncertainty bordering on a kind of panic. Is it okay to share this particular story in your book? Will the others involved be angry if you do? Will they forbid your sharing it, even?
These are questions for later, dear writer. These are questions to ask in the editing.
For now, your task is to spill. Spill it all. Get every word, story, thought, and feeling out. Tell the entire truth. Hold nothing back.