All of the Hellfire Riders stories include swearing, violence, explicit sexual content including references to group sex, sex in public and voyeurism (some main characters only watch while others participate), references to alcohol and drug use, sex trafficking, illegal cage fighting, and murder (mostly only bad guys, but there are exceptions.) There are no cliffhangers and no cheating.
Disturbing Violence: The situation my hero/heroine are in (the Cage) is bad enough, but one of the fighters is especially horrible. I try not to go into gory detail about what happens, but some detail is there, and the implication about the rest is clear enough.
In this particular book, there is also:
Sexual violence/rape: The heroine lives under a constant threat of rape, and is assaulted in an attempted rape (we saw part of this attempt in Gunner). Rapes also occur during the story—one is off-page (but the rapist gloats about it on-page) and the other is on-page but non-explicit. Neither the hero nor the heroine is raped.
Consent: In a very narrow sense, all of the interactions between my hero/heroine are consensual. More broadly, their situation adds clear noncon and dubcon aspects. SPOILERS: For the noncon, the heroine is ordered to perform oral sex on the hero after a traumatizing event. Under non-Cage circumstances, neither one would object to the act itself/being sexual with each other, but they object to the situation. She eventually agrees because the alternative is horrid. He initially says ‘no’, then agrees when he realizes what the consequences for her might be. Later in the book, the hero holds her prisoner in a cabin while he gets his payback; although she enthusiastically consents, obviously the situation adds a dubious aspect.
“Good guy” character deaths: The hero & heroine live, of course, but usually in my books only the bad guys are killed. That is not true in this book.
Grief & trauma: All of the above means that the hero and heroine have considerable grief and trauma to work through.