In order to think about current practices of political dissidence, we dive into the past and into the experience of a young artist. Invited to go clandestine in Portugal in the second half of the 20th century, Margarida Tengarrinha played an important role in the antifascist resistance, becoming a document forger for militancy. Through temporal anachronism, Clandestine is like a letter to a time to come, a premonition of the tragic possibility that History is repeating itself.