The Empty Envelope: A to Z Mysteries #5

Help Dink, Josh, and Ruth Rose solve mysteries from A to Z!
 
Kids love collecting the entire alphabet and super editions! With over 8 million copies in print, the A to Z Mysteries® have been hooking chapter book readers on mysteries and reading for years. Now this classic kid favorite is back with a bright new look!
 
E is for Envelope . . . Who is sending letters to Dink? All week long, Dink has been getting strange mail. The envelopes are addressed to "D. Duncan," but the letters inside are for someone named Doris. Plus, one envelope is empty! Could it be a secret code? And can Dink, Josh, and Ruth Rose crack it?