Follia omicida

His name is Johnny Boia and he is a very wicked gunslinger dressed in black. Or almost…Actually it is Bat Batterton's new, improbable disguise. His present client is the archaeologist, George Mac Leod, who is going to see his friends Jim and Margie Coleman, owners of a ranch in Stone-Hill, Vermont. Near their farm rises a dolmen, an ancient Celtic building, obvious proof that the Celts landed in America before Columbus…

With 410 pages this is now longest Zagor story surpassing La radura delle voci (404 pages).