E.C. Tubb 
To Dream Again 

As an officer in the United Nations Law Enforcement Agency Ralph Mancini was dedicated to the worldwide War on Drugs, employing all the resources of the U.N., whilst working with the national and international police forces. But now an insidious new drug was being developed, one in which the people taking it experienced a trip like no other. They became, in effect, God-like beings, and once they had experienced ‘heaven’ they could think of nothing but their next trip — whatever the cost. Ralph and Inspector Frere follow a tangled trail of murder and intrigues to try and find the source of the peril-but will they be too late to stop it spreading across the world…?