The Existence of Bea Pearl, Paperback/Candice Marley Conner

When orders came to evacuate due to rising floodwaters, Bea Pearl followed her brother down to the river. Only she returned. But she knows he isn't dead. Even if her parents don't agree. Even if the entire town doesn't believe her. She knows it's true. When her parents have him declared legally dead, Bea Pearl decides it's up to her to figure out where her brother could be, and with her limited clues, she begins to unravel the mystery of his disappearance. She must unearth the truth. Otherwise, the rumors are true and she has killed him. And if he can stop existing, could she stop existing too?