Books for 8-12yr reading level, but suitable for 5yr old (emotionally & thematically)

Looking for book recommendations that suit 8-12 years reading level, but suits a 5 year old in terms of emotional maturity and themes. (For a 5yr old who has very advanced reading skills but is very sensitive and otherwise developmentally at 5yrs old). Occasional illustrations are nice but not necessary. Book series that have been [...]