Fresh from pulling off her latest heist, Cat Montgomery believes she's ready to leave her thieving lifestyle behind. But old habits die hard. When she's recruited to retrieve the Lionheart, a legendary medieval ring made from the finest gold and excavated from the grave of Robin Hood, Cat's determined to end her career with a bang.

Or so she thinks…until the Caliga Rapio, a mysterious brotherhood of thieves, beats her to the punch. Now she has to hightail it to Venice to swipe it back. With two old flames thrown into the mix and an Interpol agent hot on her tail, things are about to get a lot trickier. Cat's troubles only worsen as she realizes the legend of the Lionheart runs deeper than she could have possibly imagined…