You Only Die Twice

"The genius twins Coke and Pepsi have narrowly escaped a vat of a Spam, a pit of boiling fry oil, and a score of crazed adults all bent on killing them. But just when they thought they were safe, their arch nemesis Dr. Herman Warsaw reappeared, engaged to their Aunt Judy! Whoa—didn't he die already?! Now, as the twins continue their family road trip from Washington D.C. through the South, it will take every bit of their genius abilities to outwit their wacky enemies. It doesn't help that their parents remain totally oblivious! When they finally get to Graceland, Elvis's home in Memphis, Tennessee, Coke and Pepsi come to an explosive conclusion you'll have to read to believe!"