Tony knew that, as in all prisons, both in-coming and out-going mail
was read by authorities.

He received a letter from his wife asking, "When do I plant the
potatoes?" so he replied, "Do not, under any circumstances, dig up our
old garden.  That's where I hid all of the bank money."

Two weeks later his wife wrote back, "Six sheriff's deputies came to
the house. They dug up every inch of the backyard."

Tony picked up his pen. "Dear Maria," he wrote, "now is the time to
plant the potatoes."