Deep in the heart of London, the Monsalvat Bank is small, secretive, and fabulously wealthy. When Ellie Stanton, an impoverished graduate student, is unexpectedly invited to join the firm, the privileged world they offer looks too good to turn down—but the bank is more than it seems. Soon Ellie realizes that her life belongs to her employers, and that they're watching her every move, for buried in their medieval vaults lies a closely-guarded treasure of immeasurable power—one inextricably bound up with Ellie's own history. Now Ellie is in a race against time, hunted by the bank and pursued by her past, her only hope of escape to unearth the secret hidden in the vault—but getting in is only the beginning.