Size 33×48 cm. Pencil and ink.
Originale Page Dylan Dog & Martin Mystère n.1, Writers ALFREDO CASTELLI – TIZIANO SCLAVI – Artist GIOVANNI FREGHIERI.

The first historic team-up between the Investigator of the Nightmare and the Detective of the Impossible.

London, 1990: the disappearance of an urban caver in the subway is the sign that, after many years, a terrible enemy is reappearing in the destinies of Dylan Dog and Martin Mystère. The two had previously faced the threat together twelve years ago, but now they must once again sink into underground London, where a dark evil is about to be awakened.