With her dad in the hospital, Bea finds herself staying at her grandmother's apartment the same way she did the summer before her mother died. As she avoids her fears about the situation, she discovers she can see imaginary friends, and they enlist her to help them get reassigned to new children after their people have grown up and moved on, thinking they no longer need their old emotional supports. The more she tries, the more she realizes that the real solution to all their problems may need her to face down her biggest emotions.