Popular book series for your 13 year olds.
Soul of the Deep
by Natasha Bowen
Skin of the Sea (book 2). Fantasy series and love story inspired by West African mythology featuring a mermaid protagonist. Age 13+.
The Iron Sword
by Julie Kagawa
Evenfall (book 2). Evenfall is a spin-off of the seven-volume Iron Fey fantasy series which starts with The Iron King. Age 13+
The Merciless Ones
by Namina Forna
The Gilded Ones (book 2). West African-inspired fantasy in which a young woman becomes a powerful warrior and fights against oppression. Age 13+
Defend the Dawn
by Brigid Kemmerer
Defy the Night (book 2). Fantasy adventure and romance set in a plague-ridden and corrupt kingdom, featuring a heroine who will do anything for justice. Age 13+