A good simple children's illustrated introduction to the old and New Testaments. Followed by Parent Pages that can be used as extensions to share and understand more deeply the teachings on a practical level. Biblical citations are next to the Parent page, but unfortunately no back references to the content in the book.
This is a good book for getting the 'general idea': the sequence of events historically, the basic characters - their names, roles, and basic character, where things were happening, and some definitions. There are few details, interpretations, anything deep, scary, or judgmental.
IMO, the book could be read to any pK-3 group (it might not build on what older students
already know) ... it could be leveled up to 5th grade for readers. It really depends on your groups.
The extensions are useful for all ages.
A simple basic map would have been useful.