The Favored Son is the tenth book in the Gareth and Gwen Medieval Mystery series.
This time, Gareth and Gwen and the small group of knights known as the Dragons which Gareth heads are out of Wales and away from King Owain and Prince Hywell and their masters at the court of Gwynedd for the entire book. Instead, they are at Bristol Castle in England where they have been summoned by Prince Henry of England, son of the Empress Maud, to investigate the death of his uncle, Robert, Earl of Gloucester. The Earl was Empress Maud’s strongest supporter in her contest with her cousin Stephen for the throne of England.
Prince Henry thinks someone hurried his uncle, who had been ill for a long time to an unnaturally early grave, and has requested Gareth and Gwen’s assistance to prove his theory and discover who was responsible. Henry’s cousin, William, who is to replace his father as Earl of Gloucester is not at Bristol when the two Welsh sleuths arrive, but he does not think there was any unnatural assistance in the death of his father.
They discover right away that one of the reasons for Henry’s suspicions is that two of the Earl’s closest servants died shortly after he did. Then, before they are even done talking to Henry, word comes that the castle steward, Sir Aubrey, has been killed by a stone falling from the castle battlement.
More people turn up dead over the next couple of days. Gareth and Gwen, assisted by their adopted sons, Llelo and Dai, and Prince Henry’s bastard half-brother, Hamelin, discover a couple more bodies. Llelo is involved particularly deeply in this investigation, especially since, Gareth gets corralled into some sort of meeting of all the English lords in the area where he meets the new Earl William, newly returned from visiting his other castle. Shockingly, King Owain’s renegade brother, Cadwalader, turns up at this meeting too. Nobody trusts him, but he doesn’t get caught doing anything this time. In fact, he is unaccountably friendly to Gareth, which is just creepy.
The investigators discover a lot of reasons for the various murders, including spying, a possible love affair, gambling debts, and so on. The death that was presumed to be a suicide turns out not to have been a death at all, and this person swears that Earl Robert was not murdered at all. Prince Henry admits his error, and he and his cousin William are reconciled. I’d say everything ends up well, but the meeting of the lords was to decide what they wanted to do about attacking King Stephen. And Cadwalader is still about; no telling what that means for the peace of the land.