I've been waiting for Gabe's book ever since he appeared in The Guardian Angelinos series. I always imagined a heroine deserving of him enough but can also bring him to his knees. A heroine that's strong enough to match him but also challenge him. And the author definitely delivered in Lila/Isadora. 
 Book 1 and 2 built up to this finale. Gabe thought he lost the woman he loved along with his only son. Until a woman shows up claiming to be Isadora and that his son is also alive and well. In a world of spies, Gabe is a lone wolf, who always have his guard up and does not trust anyone. So could he actually believe this woman? She looks, talks, walks, and carries herself differently from Isadora. 
 Lila Wickham has been so deep undercover for the last 5 years, she's no longer the same person. Now that she's free from her CIA duties, she wants to return to the man whom she left years ago, but would he believe her story let alone recognize her? 
 The premise behind this story is intriguing though you may have to suspend some disbelief to buy into it. I don't know much about CIA stuff but perhaps implantation devices could be done (scary thought). Gabe took a while to see who Lila really is, she knows things that only Isadora would know, but then again she's a spy. I found his resistance plausible. Would you believe someone who shows up claiming to be the person you loved and lost? 
 The tension toward the end is quite high as Gabe and Lila figure out who's behind the implants. I couldn't guess who the baddie is until they showed up at the doorstep. 
 Gabe and Lila are wonderful together. He's cocky, but loyal and protective. She's stronger than she used to be but also vulnerable in many ways. Rafe is a devil child, he's cute but kind of bratty. I love that Nino could take him under his wings. 
 Overall, a nice conclusion to Gabe's story that I've been waiting years for. I guess you can say it's worth the wait.