Bridged by Kendra Elliot

After a congressman’s tortured body is found dangling from a Portland bridge, the FBI joins the Oregon State Police to investigate the case—and FBI Special Agent Ava McLane, still recovering from a bullet wound, hunts the twisted killer alongside the man who captured her heart, police detective Mason Callahan.
But once a third body appears and all evidence points to a serial killer, the public furiously clamors for answers—and the couple’s relationship grows fractured under the pressure. Ava and Mason search in the past for clues that predict the future. And when Ava’s mentally ill twin spins out of control, the FBI agent who battles monsters every day wonders if she shares her sister’s self-destructive streak…

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Serial killer with cruel pattern is on the loose, and the joint task force is leaving no stone unturned, while trying to find clues, to stop the killings.
Ava and Mason fell in love during the book 1 in the series. Now they are living together, their relationship and commitment deepening, as they learn more about each other. They are ready to take the next step in the relationship, as soon as the 'bridge killer' is caught, and they have time to look for a house together. But first they have to find the killer, and if possible, save Ava's twin sister, from even more self destructive behavior.
The task force, where both Ava and Mason are part of, seems to be facing an impossible undertaking, since there are no clues, why and how the killer is picking up his victims. The story is moving rather slowly at the beginning, every detail of the hunt for the killer is described. There's not much intensity, more like frustration in the air, since nothing seems to be connecting the victims. Don't know if  the energy would have picked up, if some of the detail, not having to do with a plot so much, would have been left out. It can be distracting, and makes the story move slow..
But towards the end, a surprising twist in the tale, makes the wheels go faster, anxiety and tensions rise, and the need to solve the case is urgent.
I wish the beginning of the story had the same sharp, intense feeling as the ending, that for me, saved the book completely. Since the Ava and Mason were established couple already, whom loved each other with fervor,  and the energy between them was nicely settled, the mystery of the murders should have brought up the acuteness and vigor. But the last forty percent saved the story on that part, earning the book
~ Three Spoons