Dead Man Walks
Disguise for murder.
Drake is told that some guys had been working on tropical plants and had found a very deadly bacteria that could be used as a bio-warfare weapon. All the men on the team are supposedly now dead, though, under mysterious circumstances. He's also told that an area in Kashmir has had plants killed by such a bacterium and he's being sent there to find out what is going on.
The wife of one of the men is out looking for orchids and Drake is following her.
A guy gets into Drake's room and tries to kill him that night.
Drake confronts the wife of another supposedly dead team-member.
Drake makes sure she gets a fake letter then follows her to where her husband is hiding.
The guy and his helper are caught and Drake sets fire to the guy's lab to make sure no one ever gets to use the deadly bacteria again.