The first in the series featuring British intelligence's elite detectives by the Edgar Award-winning author.   Millions of lives are at stake if a sinister international conspiracy succeeds. It's up to England's elite detective agency, Department Z, to make sure that doesn't happen.   They've got to keep things quiet, too. Discretion is something the Hon. James Quinion knows only too well--it's all part and parcel of being a member of the secret service. Now, as Department Z's agents prepare for this high-profile, high-risk assignment, Quinion will find himself right in the line of fire--and in personal danger . . .