Cruise is Caleb's story, son of Menace, that we got to meet throughout the whole series growing up and especially in Menace book, where we get to see his bond with his father and what meant for them to grow up without a mother.
As a kid, he always wanted to become a cop like his father and to be part of the same team that he already calls family because he really grew up with them, and now, not a child anymore he is part of the team, although they might still see him as a kid and don't take him seriously.
Risking his life every day in his job doesn't mean that he is satisfied completely with his life, and after saving Ruby from a disastrous date, he shows her that he can be more than a pretty face and we get to read about a sweet and beautiful love story between two characters that even if they're young, their feelings for each other are strong and they are learning together how to trust and build a relationship.
Same great writing, not to much angst or drama, love above all.