Start with high-confidence 1837 1901 books, then narrow by subgenre or adjacent topics.
Meet the Georgians: Epic Tales From Britain’s Wildest Century
Robert Peal
Love in the Time of Victoria
Francoise Barret-Ducrocq, John Howe
Beyond Vanity
Elizabeth L. Block
Victorian Culture and Society
Adam C. Roberts, Adam Charles Roberts
The Regency Years
Robert Morrison
Victorious Century
David Cannadine, Kris Dyer
The Prince and the Plunder
Andrew Heavens
Victorian Nightshades
Elizabeth A. Campbell
London Life in the 18th Century
Mary Dorothy George
The Essential Handbook of Victorian Entertaining
Autumn Stephens
Eighteen
Alice Loxton
Dominion
Peter Ackroyd
The Other Victorians
Steven Marcus
Christmas
Mark Connelly