The book opens in London in 1902 ,when Holmes becomes aware of a series of coded messages appearing in a local newspaper .They are from "Benjamin
Franklin" to "Charles Stuart" and the great detective is not peruaded they are as innocent seeming as they appear,suspecting they may be linked to the cause of the Jacobites -those dissidents working for the restoration of the Stuart dynasty to the throne of Britain.He also suspects an American connection .He goes ,with the faithful Watson in tow ,to Regent's park where the correspondents are due to meet ,and discovers the murdered body of one of them-the Benjamin Franklin of the pair .Soon another body turns up in a London hotel room -that of a lawyer McNair,the Charles Stuart of the messages.
Holmes is advised by the US secret service representative in London of the "American angels"-gold coins ,minted in France and destined to fund the American cause in the War of Independence but which never reached America .It is believed that they may have been located in Scotland and been targetted by American anarchists behind the recent assassination of President McKinley ,in order to fund further atrocities.Holmes sets out for Scotland to ferret out the truth ,and the whereabouts of the gold and to forestall the conspirators in the process.
What follows is a busy and lively plot ,with some fine descriptive writing of the Scottish countryside by way of a bonus.There is murder ,grave robbing and attempted poisoning before the resoltion of the case.It is fast moving ,nicely melodramatic and has some nice creepy scenes in a haunted island graveyard.The whole thing is well written ,nicely researched addition to the Holmesian pastiche genre and is recommended with confidence to those who read such titles