"A Trail of Ink" is Mel Starr's third book in his Hugh de Singleton series. (There is a fourth-book-to-be, as excepted in the back of the third.). Hugh is a bailiff and surgeon (not physician) who is the employ of Lord Gilbert, from Bampton, a small town not far from Oxford. He's a young man - trained in Paris and Oxford - and is making a name for himself in both Bampton and Oxford.
Mel Starr's series of medieval mysteries will probably not appeal to the ordinary mystery lover. There seem to be a small subset of mystery readers/history jocks, who, in a Venn diagram would meet at Mel Starr's books. The novels are very well written by Mr Starr, an American teacher, who is familiar with both medieval history and science.
In this third novel, Hugh has left Bampton for some errands in Oxford. He is hesitantly - and rather ineptly, so it seems - courting a stationer's daughter, Kate Caxton. That his suit is successful really depends on the forthright Kate, who doesn't suffer fools gladly and is able to see past Hugh's timidity in courtship. Hugh is also in Oxford to help track down 20 (or 22) books - handwritten as they were then - belonging to the noted John Wyclif. The books were stolen from Master Wyclif's rooms and are up-for-grabs. Hugh manages to get himself and his helper, Arthur, in-and-out of trouble, both physical and legal.
Starr's characters are well-written, as are his plots. The reader learns something - a lot, actually - about 13th century England and its people. Good reading, again, for the self-selected reader.