- "The more vicious the lie...the more explosive the truth!"
- — Tagline, from the front cover
The Hardys have come thousands of miles in search of their father's killers and will go to the ends of the earth to complete the job. From Stockholm to Copenhagen to Berlin, the trail is getting hotter by the minute -- and their mission ever more critical. They've uncovered a shocking new piece of evidence: Fenton Hardy may be alive after all!
But the boys are working without a net, with no one to trust: not the beautiful Ilsa Khoo, not Interpol, not even the U.S. Government. Someone inside the operation has betrayed the investigation, leaving Frank and Joe out in the cold. They'll have to go it alone and infiltrate Phoenix Enterprises no matter the risks. The time has come to face the truth and face the enemy!
=Businesses and organizations
- For many fans The Phoneix Equation is the last "canon" Casefile, due to the fact that many of the Casefile stories after this book became more similar to the types of books that were being written for the Hardy Boys Digests books.
- Another reason is that in the A Hardy Boys and Tom Swift Ultra Thriller Time Bomb the timeline gets reset, causing the books that take place after The Phoenix Equation and Time Bomb to be taking place in a different universe, that had the Hardy Boys solving extremely similar cases.