Each novel is stand alone, but builds on what has gone previously. If you have been reading in sequence, by this time John, Gwyn and Thomas are now like old friends.
If you are just entering the Crowner series this is a cracker of a story to start with.
In this, the sixth Crowner John mystery, Crowner finds himself with a murderer who has all the hallmarks of a priest. The local priesthood take exception to his line of inquiry, circulating rumours that John's clerk, an ex-priest may indeed be the killer. John finds himself helpless as his clerk Thomas is accused and summarily judged to be guilty by the visting Justices. (Medieval justice left a lot to be desired). Thomas is sentenced to hang and John has just 24 hours to sort it out...
Cracking read with a wonderful twist to the ending.
If you like medieval mysteries this is one of the best I have read in a while!