I recently (re)read A Dangerous Fortune by Ken Follett (1993).
In this novel, KF takes us through the life and times of a prominent British banking family (the Pilasters), around the turn of the 20th century.
As usual, KF masterfully runs several intriguing subplots, intertwined with each other, while tying all to the main plot - the rise and fall and rise of this influential family. Laced with political machinations, international financial dealings, betrayal, lust, love, murder, familial loyalty (and not), KF weaves a wonderful tale while at the same time providing an excellent tutorial on British history as well as the mechanics of the banking industry.
I'll read anything KF writes, fiction or non-fiction.