Never underestimate a librarian. Comfortably padded and in her middle years, Shona McMonagle may look bookish and harmless, but her education at the Marcia Blaine School for Girls has left her with a deadly expertise in everything from martial arts to quantum physics. It has also left her with a bone-deep loathing for The Prime of Miss Jean Brodie, that scurrilous novel that spread scandalous untruths about the finest educational institution in Edinburgh. Her skills, her deceptively mild appearance, and her passionate loyalty make Shona the perfect recruit for a new and interesting project: Time-travel to Tzarist Russia, prevent a gross miscarriage of romance, and – in any spare time – see to it that only the right people get murdered. It's a big job, but no task is too daunting for a Head Girl from Miss Blaine's.