Best of Enemies is a Nancy Drew and Hardy Boys Supermystery novel.

After the deconstruction of the Berlin Wall, an undercover agent working for the highest levels of the United States government system, the "Swallow", is turned into a target for terror, after landing on U.S soil. A German espionage agent, and a rogue operative are both after the man, and it is up to the Hardys to crack the case. The leads direct the duo to Nancy Drew, and her client, Beau Davis, who is accused of stealing a guitar which was once owned by Elvis. The two cases then clash together, and the trio find a connection. Now they must find the culprit, and end the mayhem, battling a murderer in the process.