Closer: Tunnels Series, Book 4

Near-constant danger, peril, and violence in a fantasy setting. There's one very shocking death of a key character, as well as other brutal killings (some with a particularly gruesome aftermath). Weapons include guns, bombs, crossbow, a pit trap, nerve gas, knives, explosives, and more. The book opens with an inferno-like explosion that two characters narrowly escape; one has a very serious gunshot wound. Characters are held captive, tortured, roughed up, threatened, slapped, and more. Some physical fights, including between adults and teenagers. Description of predators eating/killing their prey.

Romantic tension between Will and Elliott; they have feelings but don't act on them. Will admires Elliott's looks.

Mostly British insults/slang, including "bloody," "prat," "arse," "sod off," etc. Also cut-off uses of "bitch" and "bastard" (full words aren't uttered, but it's clear that's what the characters intended to say).

Not glamorized: A self-pitying character has been hitting the bottle (vodka) pretty hard, sometimes to the point of blacking out. He suffers the consequences (hangovers) and stops drinking too much once he has a clear purpose again. References to beer cans/bottles, and Drake confronts a rude driver who has been drinking. A couple of brief references to characters smoking.