Each Maisie Dobbs book addresses some aspect of the Great War (cartographers, chemists, artists, disabled veterans). In A Lesson in Secrets, conscientious objectors take the stage. Maisie goes undercover for Special Branch, teaching philosophy at a college to determine whether or not political forces that do not have the interest of the Crown at heart are infiltrating Britain's institutions of learning. And of course, there's a murder that she has to solve that happens to be connected to her task.
Maisie as a character has definitely blossomed in the past few books; Jacqueline Winspear does a wonderful job at slowly developing our heroine's character. For much of the series, Maisie was serious and rather dour, held back by an inability to let go of her war trauma. But since both her wartime love and her lifelong mentor died in recent books, sad as those events were, it's as if our heroine finally has wings of her own to grow.
The next book is due out in March. I'm already on the waiting list at the library!