Too Many Traitors (Hardy Boys: Casefiles, #14)

Triple threat

When Frank wins an all-expense-paid vacation to Spain's Costa del Sol, the brother detectives are set for some good times in the sunny paradise. But instead of flamenco music and bullfights, Frank and Joe find themselves running from the law.

It seems their official tour guide has been murdered, and the evidence points directly at them. To make things worse, the Hardys are also being hunted as spies by the KGB - and as traitors by the Network. Trapped in very tight spots, Frank and Joe need every ounce of daring and kill... to keep from being shipped home in matching boxes.