Virginia Cowles was, per
Wikipedia, an American journalist, biographer, and travel writer who reported on the Spanish Civil War and World War II (and the events leading up to WWII). Although she was American, the British government awarded her an OBE in 1947 for her reporting. So, when I noticed two of her books on sale for $0.99/£0.99 at Kindle US/UK, I figured I'd give them a try - or at least buy them and put them relatively high on my TBR list...
The Astors is the first of three "Dynasties" books she wrote - the others are on the Rothschilds and the Romanovs.
Kindle US:
https://www.amazon.com/dp/B07B5PRD4K
Kindle US/Smile:
https://smile.amazon.com/dp/B07B5PRD4K
Kindle UK:
https://www.amazon.co.uk/dp/B07B5PRD4K
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B07B5PRD4K
The Great Swindle: A History of the South Sea Bubble
Kindle US:
https://www.amazon.com/dp/B07FLP9P42
Kindle US/Smile:
https://smile.amazon.com/dp/B07FLP9P42
Kindle UK:
https://www.amazon.co.uk/dp/B07FLP9P42
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B07FLP9P42
They are also KU if you have a subscription...