Regan Merritt, a former US Marshall, has already lost so much.  After the murder of her ten-year-old son, her marriage crumbled.  She left her job and moved to Arizona to be with family, but it was the murder of her former boss, Tommy, after he left her a message that he was investigating her son's death that brings her back to her former home. She is determined to uncover what new evidence Tommy had uncovered, no matter the cost.  The more she digs for answers the more dangerous her mission becomes.

Allison Brennan skillfully brings Regan to life in DON'T OPEN THE DOOR, the second book in the Regan Merrit series.  She is methodical, clear thinking, organized, and highly skilled.  Rarely wearing her emotions on her sleeve, Regan is very good at what she does. The narrative is so well written, readers can connect with the protagonist as she tries to reconstruct this baffling case. What is the real reason her son was killed?  Well-plotted and filled with several twists, this story is immersive. 

Allison Brennan brings to readers a multi-layered murder mystery.  As the story races to its conclusion, once seemingly non-connected pieces and secrets come together to reveal the painful truth. I found DON'T OPEN THE DOOR to be a well-written and engrossing story.  Highly recommended.