Spy vs. Spook: Book One
Mark Vincent is WBIS—Washington Bureau of Intelligence and Security. Quinton Mann is staunchly CIA. Mark thinks the CIA is full of dilettantes who leave him and the rest of the WBIS to clean up their messes. Quinn thinks most WBIS agents are sociopathic loose cannons. So they don’t exactly get along.
Of course, just because they don’t like each other doesn’t mean they can’t play mind games on each other. Or sleep together. But when an explosion at Mark’s apartment sends Quinn to the morgue to ID a body, he has to reevaluate his position on denial.