I would like to give a memorable title to a short text that I am writing and I thought of the above one in reference to the short novel by E. A. Poe, The Purloined Letter.
A few attempts with automatic translation tools gave me mediocre results and my Latin is unfortunately very rusty. I would really appreciate if someone could help me with this translation.
Nb.: the capitalized word "Arithmetic" refers to the field of mathematics studying numbers and is thus intended as a noun, not an adjective.