Letter #23

Image of a type-written letter, the text of which is below.

Dear Clara,

I have divined the secrets. The parchment has been used by ink which reveals itself only through heat.

Per the instructions now revealed, a key is hidden in the small box, and the back of the parchment contains a map, also revealed in heat. The compass will be required to find my way.

I shall go as soon as I can find a boat.

We have done it.

Yours,

Andrew