I have never heard of Ann Perry until very recently when I came across her books by chance. I was about to start reading her other established series then I was informed Ann Perry is going to have a new spin off. Thanks to the generosity of the publisher, I obtained my copy via Netgallery for my early enjoyment.

Introducing in this series is Daniel Pitt, a young lawyer who possesses excellent qualities to be an investigator (genes inherited from his father who is the head of the Special Branch featuring in another the series by the author) and a defense lawyer. Other potential core characters equip different sets of skill which compliment that of Daniel's. In the current installment, they work together to bring the truth to the surface and put the bad guy behind bar.

"Twenty-One Days" basically is all the time Daniel has to dig up the proper evidence to prove his already convicted client's innocence. Yet, immediately after his client's exoneration, Daniel has to bring justice to the exact then client who is guilty of bigamy.The characters, the plot, and the tension are well developed. I actually got emotional when the good client Daniel wants to help is announced "not guilty."

There are plenty of investigation and courtroom drama throughout which makes "Twenty-One Days" an interesting read. The story is set in 1910 when forensic science was gradually introduced into courtrooms as means of evidence.

4.5 star for the overall enjoyment and the quality of writing. Will definitely want to check out other books by the author.