Hester’s job is to accompany the elderly and infirm Scottish lady, Mrs Mary Farraline, on a train journey to London. However, the elderly woman dies during the night and post mortem examination reveals a lethal dose of medicine. Hester is charged with murder and faces the gallows. Monk must find the calculating killer amongst the prominent and coolly unassailable Farraline clan and barrister Olive Rathbone can only sit on the sidelines as this case is heard before a judge in Edinburgh, where Scottish law rules….