The devil you know / Chris Hauty.

An associate justice of the Supreme Court is dead, killed by the very police officer assigned to protect him. As shockwaves ripple through the country, Hayley Chill's superiors suspect the assassination is only one part of a major conspiracy. When a busload of children is taken hostage in Maui, and a vacationing justice's death is demanded as ransom, Hayley leaps into action. Together with a deputy US marshal, she embarks on the monumental task of rescuing the children while also protecting the justice. But with danger around every corner and no one to trust, has she finally bitten off more than she can chew?