In Maisie's world there is no internet; she is persuaded to install a phone and accept the loan of her benefactress's car. She's definitely low tech, so she relies on her well-developed intellectual gifts.
There are no bad guys in this story. Maisie begins by investigating a wife's suspicious activities, which leads her to a cemetery, which leads her to a retreat for servicemen who are so disfigured by war wounds they can't bear to be seen in public. The scene in which she de-fuses a terribly dangerous situation is riveting. She walks purposely into a crowd and begins to sing the anthem of the Red Cross Nurse:
It's the one red rose
The soldier knows
It's the work of the Master's hand
Maisie Dobbs by Jacqueline Winspear
In your local library!