The Question Of Hora Da Silva (The Mysterious Mrs Da Silva)
Adventure #7 in the collection . First published in Thomson's Weekly News 07/06/1918
A member of an Anarchist group was killed by his own side for turning on them. He died with knowledge about who the major contributors to the cause were. It is hoped by the gang, and Major Haynes, that his young widow, now heading to England, also knows and could be 'persuaded' to divulge it.