Last day in limbo - Peter O'Donnell

In the jungles of South America
lies Limbo, presided over by the Mistress of Limbo, where the men and women
enslaved in Limbo have no hope of escape or rescue. Only Danny Chavasse
nurses any hope for outside he has a friend who can save him, Modesty Blaise.
Modesty, herself, has been chosen to be a slave of Limbo where the Mistress
of Limbo has commanded a bizarre sacrifice to the old gods, the death of
Modesty Blaise. To destroy Limbo Modesty must first become its captive but
the loyal Willie Garvin is alongside her when the battle begins, the battle
for survival on the Last Day in Limbo.