The Gifted Chronicles
This series tells the story of Alison, as she navigates the world of Gifted, and her surprisingly dangerous ancestry. (All of the books except First Life are told through multiple POVs, as reflected by the covers 😉 )
Etta is set in 1843 and gives a little backstory on Caleb and Etta, who appear – at least in name – in each book of the Giftedverse. Tristan is the exact same story as First Life, only told through Tristan’s point of view.