Money — Mike Wells

Elaine falls head over heels for Nick, but discovers he's not exactly what he appears. Elaine is called back to Washington to lead a top secret program to develop counterfeit-proof banknotes, but soon finds herself in Russia, running from the Mafia, and eventually in the hands of Giorgio Cattoretti, a master knock-off clothing manufacturer who has now become the world's #1 currency counterfeiter.

Book 1 in this series is a free download.