I gave up trying to read these in order! I see this is number 8, but at the library all I have to go by is the copyright dates. I decided I'd read whichever one I choose and let it stand alone.
In this one, Roger the Chapman is living with his mother-in-law after the death of his wife. I get the feeling his marriage was one of convenience and he didn't really love his wife all that much. Margaret takes care of Elizabeth, his two-year old daughter while Roger peddles his wares. He doesn't enjoy being home much. Margaret meddles in his affairs by shamelessly playing matchmaker. While he loves his daughter, it's clear he's not a very hands-on father, but will do what he must to provide for them.
As he is settling in for the winter, Margaret sends him off to bring back her cousin Adela, recently widowed with a young son. That way the women can give each other company (and Margaret can woo her charms and make sure Adela and Roger end up marrying.) Roger reluctantly obliges, and almost immediately his sleuthing skills are needed. The son of a weaver, long-presumed murdered in London, has reappeared on the scene. The trouble is, some think he's an imposter (including his sister.) Only the father believes it is his long-lost son, who is the rightful heir. Roger is called to discover his true identity. Not to give anything away, just let me say I like Roger. He's funny, he doesn't miss a trick, and this is a delightful series, set in the 15th century England. Oh, and there's a twist at the end.