Yes, Crowns in Conflict is about the 1914-18 war and the relationships between the kings. It's very moving and the portrayal of Marie of Roumania is just brilliant.
"Heart of A Queen" is about QV's 'romantic attachments' and it is written so beautifully. It examines her relationship to Napoleon III, Melbourne, Prince Albert, John Brown, Disraeli and the Munshi but it is not in any way salacious...just a really interesting book which shows so much of QV's psychological make up.
(Another great one by Theo Aronson is "The King in Love" about Edward VII's affairs...Again it's all handled beautifully and so well written!!)
What a great shame Mr. Aronson is no longer around to write more wonderful books!