Love Notes and Murder -- JeffMads 50's AU

It's the biggest case that the small town as seen since 1912.
5 murders are now 6.
The killer leaves a red fabric tied around the victim's wrist. A calling card.
Detective Madison and his partner, Detective Seabury, are the leads on the case. They follow any and every lead they can find to catch the man behind these gruesome murders.
But James Madison quickly gets distracted with a marvelous boy. He rather focus on him than the case. One break couldn't hurt. Right?
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Set in the 1950 United States.
I don't own these characters. All characters are from Hamilton by Lin-Manuel Miranda. This is not a fanfiction of the founding fathers, this is simply a fanfiction on the portrayals by LMM and the way the internet has shaped those portrayals personalities.