What is the fan mail address for Kate DiCamillo?

Great question! As of today, 8/13/2010, I'm still in the process of searching it down. On the internet, I found a fanmail address that DOES NOT work (as it keeps getting returned back to me) as follows:

c/o Candlewick Press

2067 Massachusetts Avenue

Cambridge, MA. 02140 USA

Although the above address DOES NOT WORK, if anybody knows one that does, I would be greatly appreciative. Thanks!