Yorkshire, 1921. Kate Shackleton, thirty years old, is taking tea with her friend, Doris who is on a visit from London. In the genteel environs of Harrogate's premier tea room, violence is the furthest thing from anyone's mind. But when Doris is set upon by a mystery assailant, it's up to Kate to find out why - and in doing so, she soon develops a taste for detective-work. A heroine ahead of her time, this is the story of how Kate Shackleton became Yorkshire's most tireless private investigator.