|House name||Franklin W. Dixon|
|Ghostwriter||Larry Mike Garmon|
|Cover artist||Brian Kotzky|
|Publication date||December 1990|
|Media type||Print (Paperbacks)|
|Series||The Hardy Boys Casefiles|
|Preceded by||In Self-Defense|
|Followed by||Flight into Danger|
|The Hardy Boys Encyclopedia|
- "When you're playing hardball, the game is bound to get rough."
- — Tagline, from the front cover
Foul Play is the 46th book in the The Hardy Boys Casefiles series.
Someone's embezzling major league money from the minor league Bayport Blues, and retired baseball great, manager Stuart Murphy, is the prime suspect. He wants the Hardy boys to clear his name -- and as a sign of good faith, he gives them a vintage baseball card valued at $100,000!
But the boys face a dangerous lineup of hoods and henchmen who want the card at all costs. The game is heating up fast, and every pitch is down and dirty. Frank and Joe are right in the line of fire, and they'll have to come out swinging -- or risk becoming the ultimate victims of foul play.