What's the Name of That Book??? discussion

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The Devil's Teardrop
SOLVED: Adult Fiction
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SOLVED. 90s or 2000s crime fiction with a graphologist or forensic profiler analysing a letter written by a criminal. [s]
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Part of a series?
Time period/location story takes place?
Was the detective male or female?
It was a crime novel, but all I remember about the plot is that early in the novel someone received a letter from a criminal, maybe a murderer. Then there were some chapters from the perspective of either a graphologist or forensic profiler type person, who had been asked to analyse the letter and look for any clues about the writer based on the handwriting, use of language etc.
I seem to remember one of the clues was that the letter writer had included some deliberate mistakes, e.g. they had tried to make it seem as if they were a non-native English speaker by using certain words deliberately incorrectly, but because the mistakes were inconsistent it was likely they were faking it.
Unfortunately, I don't remember anything else about the plot from that point onwards. I don't think the graphologist was a main character in the story - it was mainly told from the POV of a detective, who contacted the graphologist for help.
I also remember thinking it was quite simplistic in the way it was written. Pretty sure it was a book for adults but I read it in my teens and picked out most of the weird details about the letter myself.
Anyway sorry I don't have more info but would appreciate any help!