Tis a filler book. This book read a bit like a gap novella. Plot points created in past books were mentioned and maybe furthered but not resolved, sexy times escalated, and we visited our favorite characters (not usually all together, though?)—but nothing really was introduced in the series. Whereas the other three books had an overarching plot they followed—an antagonist or environmentally based hurdle to overcome—this fourth book is entirely relationship-based. There are smaller, personal goals of each (well, most) character(s), but overall the driving force of this book is Callie playing round 'em up. The guys treat her poorly, apologize, and sometimes sexy things happen. I don't think there's enough Callie in this one. The extra POVs in the previous book were never my favorite (because I'm a basic reader who just wants the one POV), but they were helpful in furthering things along when Callie couldn't be the POV—but this book is told 70% in the guys' POV. (That's not an official statistic—I read the paperback, I have no idea the correct percentage). But it seemed like we were jumping over Callie's experiences to focus on others. To not get into any details, an arc of one of the guys reaches it's climax, and Callie's called in to help, and we get this very brief, one-sentence mention that she tackled her fear of baseball bats that night. What? And we didn't get to see ANY of that? It's haunted her for the last three books! That's a PRIME hurt/comfort moment that could've been included easily, especially given the shorter page count in this fourth book compared to the others. Come on, Wills. You know I'm in this for the romance AND the hurt/comfort. Also, Kaleb who? All the characters are great in their own way, but Kaleb's never been in my top picks and even *I* felt kinda bad seeing him in only the one chapter. This is Nolan's book, for sure. Be forewarned in case it's not your jam (I don't find this is a spoiler since it was introduced in earlier books) but there's a LOT more M/M in this book. The explicit kind, too. (And extremely explicit—dirty talk and all—at the end of the book.) If you just thought it was a side thing in the last book, it's now a series main plot point. Do with that what you will. Happy to see Wills writing again, and I love these characters. I'm hoping for a little more out of the next book, but I'm certainly sticking around for the rest of the series.