Half a century asleep, re-activated with a single word.

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Now that is commitment, to still be a sleeper agent after being in place for over 50 years, and still being able to carry out your mission. The fact that the husband was the one that insisted on keeping the physical landline through which the deadly codeword was sent is a bit of irony.
Just enough scene setting was given to hook you in from the brief extract before being sent off to be introduced to the people who have been monitoring that very phoneline, waiting, for a long time. They didn't seem too surprised when the codeword was sent, just eager to get into the action and finally catch who they have been waiting so long for.
Then we are introduced to a young police officer arresting johns of prostitutes, who seemed to know the husband who was killed.
How do all these pieces fit together? It's a very intriguing set up that i am definitely interested in reading more of.