Bart's world begins to shift under the weight of devastating challenges, including a life-changing diagnosis for his young son, Sam. As Bart struggles to hold his family together, his wife Shannon becomes the steady anchor--caring for Sam, supporting Bart, and holding on to hope when it feels far away. When Sam and newcomer Tim Timmons join the band for their biggest tour yet, Bart must navigate the demands of fatherhood and the pressures of fame, all while helping his son find the courage to sing his own song.