Patricia C. Wrede’s 1982 debut novel Shadow Magic was the first novel published in what became her Lyra series. ISFDB lists it as the third Lyra novel, presumably on the basis of internal chronology. But the omnibus on my Kobo lists Shadow Magic as first book in the series. Lyra book order may be a problem like Narnia book order; one can wile away many a pleasant afternoon discussing which is the correct way to order the books and which way is obviously incorrect. (I vote for the correct way, as I am sure you do too.)
Merchant Maurin Atuval has just been invited into the home of his new chum, aristocrat Har of the Noble House of Brenn, when he makes a sudden discovery. He is not the protagonist of this story. Har’s sister Alethia is.
This becomes apparent as soon as Alethia is kidnapped by Lithmern.