The English Heiress Who Masterminded a Multimillion-Dollar Art Heist and Built Bombs for the IRA

“I remember thinking that if you’re involved in this, you need to accept the possibility that at the end of the day, you may have to kill people.” Rose Dugdale, then 70 years old, was huddled in a high-backed leather chair, hands folded in her lap, when she made this remark in a rare interview for a 2012 documentary series. With short gray hair and a red sweatshirt engulfing her small frame, Dugdale bore little…