A Russian businessman is shot by two men, who then drive off. Holmes and Watson are called to help but only Watson shows up. When Watson calls Holmes to find out where he is, he says he found the shooters. They were killed when their car crashed. Holmes doesn't think it was an accident, he thinks someone hacked the car and made it crash to kill them. So they learn that a program was used to hack the system and who created so they go to see that person whom they clearly see is not capable of murder. They learn that the system may have been stolen by a hacker so they try to find who. In the meantime they try to find out who would have wanted the Russian dead. But they learn he might not have been killed because of his business affairs. They learn that the man was also working for the Russian government. So could his assignment have been what got him killed? Watson meets with Homes' father.
Did You Know?
The title of the episode is based off the Latin phrase "Deus ex machina" which translates to "God from the machine". Today the phrase is used in literature and theater to describe a type of plot device that brings about a sudden solution to an otherwise unsolvable problem, usually by the appearance of some new character or by a previously unknown skill one of the current characters has. In other words it is a short-cut sometimes used by writers to allow a character(s) to be able to suddenly solve a complex problem without the writer having to explain to the audience how the solution came about or how it works. See more
At the end of the episode, when Watson does her expose on the assassination attempt and the death of Sabine Raoult, we see extracts of supposedly French newspapers; they are actually fairly bad (computerized?) translations from English to French, full of more than just grammatical errors. See more