I think my expectations were a bit too high with this one. I love history (that's what my undergrad degree is in), time travel, and female lead characters, but this book just did not do it for me. The main character was mostly annoying and drunk almost all the time, so her rare moments of brilliance/coherence just did not make any sense. I have also never cared less about characters dying than I have while reading this book...most of the time once the random character was announced dead I responded with "Who?" because none of the characters were discernible from one another. Plus, ending every other chapter with some kind of "We had no idea we would never see them alive again" nonsense pretty much tips you off that some rando side character was gonna die in a few pages. 
 Also, for a book whose characters are described as 'historians' there's little to no history whatsoever. I don't know a single historian who would care about visiting dinosaurs (shouldn't they bring scientists along for that kind of mission??) and the few visits to the past don't contain any description or historical events other than a fleeting mention of why they are there. Most of the book is dialog (which I barely understood; the author has a habit of using a pronoun without establishing who that pronoun belongs to), descriptions of what the character are eating/when they make tea, and technical descriptions about how they prepare for the missions. Then the mission itself is basically "We showed up there. We did some stuff. We drank." (view spoiler)[The casual rape scenarios were also disturbing to me. It just seemed inconceivable that Max, the lead heroine, would be so upset about the death of a man who tried to rape her and then KILL her, yet was completely unforgiving of the female she hated, Izzie. Then the man that she's in love with basically accuses her of hooking up with her attempted rapist, but she's like "It's fine, I still love you." That does not say strong female character to me. (hide spoiler)] Overall, I wish this book delivered what it seemed to promise, and I won't be reading the rest of the series.