Encyclopedia Brown and the Case of the Slippery Salamander

One Monday night Chief Brown sat at the dinner table, staring at his plate of spaghetti.  So far he hadn't slurped up a single strand.  Encyclopedia and his mother knew the reason.  
The chief wasn't eating because he had come up against a crime that he couldn't solve.  
Encyclopedia waited for his dad to tell him about the case.  Whenever Chief Brown was stumped, Encyclopedia creacked the case for him, usually by asking just one question.  
At last Chief Brown looked up.  "There was a theft at the aquarium today..."

Remember the boy detective Encyclopedia Brown and his crazy mysteries?  On April 13, 2011, Random House released Encyclopedia Brown and the Case of the Slippery Salamander by Donald J. Sobol.  Parents will remember these stories and the fun in solving the mysteries right along with Encyclopedia.  Answers to each case are found in the back of the book.

Mysteries to solve in this Encyclopedia Brown book include:
The Case of the Slippery Salamander
The Case of the Banana Burglar
The Case of the Dead Cochroach
The Case of the Roman-Numeral Robber
The Case of the Runaway Judge
The Case of the Peacock's Egg
The Case of the Umpire's Error
The Case of the Calculating Kid
The Case of the Presidential Auction
The Case of the Stolen Surfboard

Which is your favorite mystery and why?