In a multiverse where emotion shapes reality, grief is the most dangerous-and most powerful-frequency of all. Kael, a solitary sound archivist, discovers a cracked 1920s blues disc containing the final, unfinished recording of their murdered sibling. When they play it, the world splits open-not with violence, but with music. Suddenly thrust into a hidden network of parallel dimensions, Kael learns that only authentic blues-raw, imperfect, and steeped in human truth-can stabilize the rifts between worlds. But each journey risks awakening the vengeance that could collapse all realities into silence. From a city of polished glass that shatters at the sound of sorrow, to a storm-wracked realm where grief sings through the wind, Kael must confront the Curators-beings who erase pain to preserve order-and uncover a devastating secret: the killer is a grieving father who silenced his own daughter's song to prevent cosmic chaos. Guided by a wise elder named Mama Bell and haunted by a lullaby erased from history, Kael faces an impossible choice: weaponize the blues to erase their enemy from every timeline... or complete their sibling's unfinished song as an act of radical witness. Blending poetic speculative fiction with the soul-deep tradition of Delta blues, The Bloodline Frequency is a genre-defying meditation on loss, legacy, and the courage it takes to be truly heard.