Deadlock

What if the right man for the job is actually a girl? Darcie Lock is facing her toughest mission yet. Forced to take refuge in a castle on the Cornish coast, she lands in the middle of a UN peace conference that is about to spin out of control. When a hostage situation develops, she is one of the two agents left free on the inside - the only problem is that her partner is an old enemy she last met when he tried to kill her. Being a teenager has never been so dangerous.