Mr. Boggartyand the Haunted Hospital — Tevin Hansen

Not all kids get to go out trick-or-treating. That's why Mr. Boggarty and his new friends volunteered at The Children's Hospital. 
 
But this Halloween party has gone horribly wrong!  
 
Now Trix and her friends must take on a frightening ghost called The Boy Named Hoo. This Halloween spookster wants to take them all to the twenty-seventh dimension to play--forever.