3.5 stars
The book started with dual timeline marked by THEN and NOW.
THEN told an intense a day of patrol officer Callum Farrell when he had to deal with a rampant shooter. NOW is the aftermath - Cal has received promotion, he's a detective at Vice and Narcotics, his peers dubbed him "Killer Callum", and he still attends session with department psychologist. The thing is, Callum can remember ANYTHING from that day, he remember going inside the building, seeing victim bodies, but NOT the climax. And then Cal stumbled into a dead body - that may related to that day...
I thought, during the dual timeline, it was really good. The THEN chapters were fast and thrilling. The NOW makes it interesting to see how Cal struggled with impostor syndrome (he couldn't remember anything, how he could be a hero?).
But after the THEN chapters ended, and the timeline switched and moved forward to the NOW, I got frustrated with Cal. He was trying so hard to prove himself as a detective, eyeing the murder case, to the point that I thought he was being a fool. Cal didn't exactly made good impression to the Homicide detectives, he didn't listen to his older partner's advice, and worse the villain easily manipulated him.
I think Cal has the potential of being a good detective - but he will need more time and experience on the field. Let's face it, Cal's promotion to become a detective was not exactly because of his top-notch investigative nose, wasn't it? It was a way for the city to make him a hero after a tragedy.
To that note, if this become a series, I would like to read the next book.