Leiloglou, Carolyn. Restorationists

"After an experience he'd rather forget, Vincent is determined to be done with art. So when he and his little sister, Lili, spend spring break with their art conservator great-uncle, Vincent's plan is to stay glued to his phone. That is, until Lili disappears into one of the world's most famous paintings and Vincent learns his parents have been hiding something from him: Their family is the last of The Restorationists, a secret society with the power to travel through paintings--and a duty to protect them from evil forces. With Lili's safety on the line, leaving art behind is no longer an option. Vincent must team up with his know-it-all second-cousin Georgia, wrestle with why his parents lied to him, and confront both his past and a future he never wanted. Young readers are invited into a captivating universe where paintings become a portal--and adventure and danger lurk beyond every canvas" --