From Amazon.com:
Alex McAuliff has received an offer he can't refuse: two million dollars for a geological survey of Jamaica's dark interior. All Dunstone, Limited, requires is his time, his expertise, and his absolute secrecy. No one--not even McAuliff's handpicked team--can know of Dunstone's involvement.
But British Intelligence is aware of the deal and they've let Alex in on a secret of their own: the last survey team Dunstone dispatched to Jamaica vanished without a trace. Now it's too late to turn back. Alex already knows about Dunstone...which means he knows too much.

From the moment he lands in Jamaica, Alex is a marked man. But who wants him dead? Dunstone? A rival company? Or British Intelligence? Here in an
island paradise where even a beautiful woman might be a spy, every move could be his last, and his only clue to survival is a single mysterious word: Halidon.

I will be sending this out in Pyan's Red Bookbox.

Arrived in Pyan's Red Book Box. It will remain in the box.

Reviews:

Publisher's Weekly:
First published under the pseudonym Jonathan Ryder, The Cry of the Halidon is vintage entertainment from suspense master Robert Ludlum.

"If a Pulitzer Prize were awarded for escapist fiction, Robert Ludlum undoubtedly would have won it. Ten times over." --Mobile Register

RELEASE NOTES:

Released to Tribefan's Almost Anything Goes Bookbox.

got from Tribefan's bookbox.