Book The Gilded Blade — Jennifer Lynn Barnes

Everyone is a player.
In the grandest of games, there is everything to win – money, love, power, revenge – and even more to lose.
Every clue pulls them deeper.
From Texas to Prague to London and beyond, the Hawthorne family and their allies old and new are drawn into a web of centuries old secrets and mind-bending puzzles.
Every answer demands a price.
To survive, they must unravel the mysteries that bind them together . . . but some truths are deadly.