Nancy Drew and the Hardy Boys Super Mystery - Secrets of the Nile by Carolyn Keene

It is about how Nancy Drew and Bess Marvin team up with The Hardy Boys (another set of detectives). Nancy and Bess have to pretend to be Joe and Frank Hardy's newly wed wives, and that they are having their honeymoons in Egypt. That is what Jonathan Kimball State Apartment Official has told them to do. Soon they all find out that Jonathan kimball had set them up and really had them help him bring a bomb into Egypt. Nancy and The Hardy Boys and Bess, have to find the now missing Kimball, and a kidnapped girl. - Ruby