There are 2 books in the Lieutenant Himekawa series. The newest book is Soul Cage which came out in 2017.

1
The Silent Dead

Book cover of The Silent Dead
When a mutilated body wrapped in a blue tarpaulin is found in a quiet neighbourhood, Lieutenant Reiko Himekawa and her squad are assigned the case. As the youngest female detective in the Homicide Division, Reiko has a lot to prove, but she has an undeniable ability to solve crimes. When…
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2
Soul Cage

Book cover of Soul Cage
A severed hand is found in a van in the outskirts of Tokyo.Kenichi Takaoka, a contractor, goes missing, leaving hisgarage covered in blood. Lt. Reiko Himekawa is on thecase, and when the hand is identified as Takaoka's, she'sinvestigating a murder. Reiko is plunged into a world ofpast sins, forced suicides,…