Holmes is asked to help investigate the death of a retired FBI agent who was thrown into a wood chipper. They learn the agent was not satisfied with being retired and tried to solve his unsolved cases. Holmes thinks the man's death might have something to do with the abduction of a girl who went missing years ago and returned last year claiming she was held against her will. Holmes suspects the girl who returned was not the girl who went missing. But the girl's parents refuse to cooperate. Watson learns a book whose characters were fashioned from her and Sherlock and their characters are involved, so she tries to find out who wrote the book.
Did You Know?
Holmes makes elephant poop coffee. Black Ivory Coffee is the market leader in elephant poop coffee and costs over $1100. per kilo. Compare that to the $700. a kilo for the more pedestrian palm civet poop coffee. See more
When "Mina" was found 14 months ago she didn't let anyone take a cheek swab (for a DNA test) as she was petrified and hence the CSU bagged the hair she claimed to have cut off with the straight razor. It would have been more sensible to actually test the DNA using the blood on the razor blade.
The blood on the razor was the real Mina's blood as well, so it wouldn't have made a difference to the test results but it's improbable the NYPD would compare a strand of hair when they have traces of blood. See more