Isaac Bell Series Book3: The Spy

 Isaac Bell is on the hunt for the killer of some of America's finest minds . . .

1908. When a brilliant American battleship gun designer kills himself, his grief-stricken daughter is deeply suspicious. She turns to the legendary Van Dorn Detective Agency where chief investigator Isaac Bell finds clues that indicate murder.

Uncovering more suspicious deaths, Bell realises that someone - an elusive spy - is orchestrating the destruction of America's brightest technological minds. And the murders all connect to a top-secret project known as Hull 44.