Shadows by Ilsa J. Bick

In a frozen post-apocalyptic wasteland, survivors fight to reunite while battling cannibalistic mutants and uncovering the dark, violent secrets of the remaining human settlements. 

This book contains: alcohol, animal cruelty, anxiety, body horror, cannibalism (pervasive), child abuse, controversial religious commentary, cults, dark content, death/grief (pervasive), deception, depression, drugs, dubious consent, gore, horror, murder (pervasive), non-sexual nudity, oppression, parental neglect, profanity, sexual activities/nudity, sexual dialogue, suicide, smoking, theft, torture (pervasive), and violence (pervasive).