Adult Mystery? novel, includes a fold out Map which is key to solving the mystery. Title includes "Garden" or something similar. Read 2008-2012.

[Jaclyn-Kate]

I’m looking for a book I bought from borders which had a fold out map. I believe the word garden or something similar was in the title. I also believe the protagonist may have been male and the key to solving the mystery was the map.
I left this book behind somewhere, never got to read it and don’t have much to go on.

[Kris]

Jaclyn-Kate, is this book for kids, teens or adults?

Around what year did you find this book?

I added a few details to the header/ topic title. Feel free to edit it.

[Jaclyn-Kate]

I believe this was an novel for adults, but not an ‘adult’ novel. I believe it would have been between 2008-2012.