Blake & Mortimer - Volume 24 - The Testament of William S.

In Venice, a boating accident leads to the discovery of a 400 year old text
bearing the signature ‘W.S.’ and promising the truth about the ‘Shakespeare
mystery’. That very night, someone tries unsuccessfully to steal the precious
document. The discoverer, Marquis Stefano Da Spiri, decides to send a copy of
the document to a specialist of the Bard in London for stylistic
authentication. As for the original, he entrusts it to an old comrade in arms
from WW2: Captain Francis Blake…