A thriller book cover design: how to make an exciting book cover

I just started working on the book coverĀ  design for Blake Eccles “EXTRACTED”.The description I have to go from is this:

A global investigative team follows leads on the strange
disappearances of citizens from every country
worldwide. These missing and exploited persons
have been subjected to government hit teams, sex-slave
traffickers, alien abductions, etc., etc. A world-government
team of investigators are selected to solve the mystery
and/or recover the missing.
This is happening on an ever increasing scale and is
bordering on hysteria in the news media.

So, I need to get a) international b) thriller c) kidnap/capture d) investigators/government. Although these samples are pretty messy, I think the excitement is already there and one of these can be cleaned up into a powerful cover.