F. Paul Wilson 
Deep as the Marrow [EPUB ebook] 

The New York Times–bestselling author of The Select “combines medical and political intrigue into one explosive, warp-speed thriller” (Douglas Preston).   To end the war on drugs, the president of the United States decides to legalize narcotics—and tax them heavily. Some think he’s crazy. Others want him dead.   The president’s personal physician, John Van Duyne, took an oath to do no harm, but after a Colombian drug lord kidnaps his six-year-old daughter, he’s forced to do the unthinkable to save her: poison the president.