Paranoia or Reality Chapter 1

Third in the series to Lines Crossed and Poisk, set three years on. Callen and Nell are in danger with their children once again after their next door neighbours are injured and killed. Thinking immediately they were the targets, Callen places Nell and their three children into hiding. Is this another attack on NCIS or him and his family? Or does this case have something to do with another operation within NCIS that has nothing to do with him?