A Calculated Risk — Katherine Neville

When her boss axes her latest proposal, financial executive Verity Banks plots the ultimate corporate revenge: break through automated security and hide some money in a place no one will find it, then point out to senior management how easy a theft really is.

Then financial wizard Dr. Zoltan Tor, Verity's former mentor, ups the ante: why not steal a billion dollars, invest it to earn thirty million in three months--and put the original billion back before anyone notices? And to heighten the challenge. Tor and Verity will compete against each other, though Tor gives Verity an edge: she can use a computer for her theft, but he cannot....