Inkdeath by Cornelia Funke

This is the final book of the Inkheart trilogy, Mo must defeat the tyrannical, immortal Adderhead ruling the magical Inkworld.

This book contains, alcohol, body horror, dark content, deception, drugs (in the form of magical substances), gore, infidelities,
kidnapping/imprisonment/slavery, murder/death (adults/children), profanity, sexism, sexual activities, sexual abuse (implied involving minor children with adult), sexual assault/harassment (referenced),
sexual innuendos, torture, toxic relationships and violence (excessive).