With the help of a new invention from Doc, Sean and Melissa win an all-expenses-paid trip to Washington, D.C., where they hope to solve the mystery of a missing helicopter--and of a haunted hotel.
This is a very very fun book, but there are funner ones such as The case of the Ghostly Hotrod, and Fangs for the Memories. Mrs.Tubbs(Shean and Melissa's neaghber)make this book very funny. Bloodhounds Inc. is searching for a goverment helacopter called The Drogonfly! This is very fun!
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