Head Case

Sixteen year old Thea Hahn is exceptional. What on earth can I talk about to a kid gifted in mathematics and astrophysics? ..wonders Anna Lee. But Anna, Briefly Security's youngest agent, has another problem - this daughter of strangely cold and withdrawn parents is missing and Anna is searching London for her.

To all appearances Thea Hahn is a model teenager. Brilliant, says her economics tutor. No trouble at all, says the cousin who should have kept a closer eye on her. But beneath the flawless surface Thea conceals painful secrets. And what Anna is looking for is not at all what she eventually finds.