The deeper the grave, the darker the secret...
Only one possible lead:.
No motives.
No witnesses.
Last seen on a spring break cruise.
Beloved daughter of a world leader in biotech.
College student.
Missing person.
It\'s the kind of case that chills Caitlyn to the bone.
From the ancient mysteries of a Mayan temple to the sinister secrets of modern medicine, FBI agent Caitlyn Tierney uncovers crimes that have been buried far too long and far too deep...
The deeper the grave, the darker the secret..