The City in his Blood. The Kingdom Beneath the Skin, #1

Inside every human body lies a kingdom no ordinary healer can see. Mina Vale has failed as a healer's apprentice, but when her beloved brother Ren falls into a deadly fever, she refuses to stand beside his bed and wait for the bells of death. Desperate to save him, Mina risks an illegal descent into his living body - and discovers a breathtaking hidden world beneath the skin. There, blood flows like a crimson river.
Organs rise like ancient cities. Bones stand like towers. Immune cells march as soldiers. And illness is not simply sickness - it is war. As Ren's inner kingdom comes under attack from a terrifying disease army, Mina must navigate a world of living vessels, wounded memories, fever storms, and impossible medical magic. But the deeper she travels, the more she realizes that her brother's illness may be connected to something far greater than one dying boy.
Dark, emotional, and richly imaginative, The City in His Blood blends fantasy adventure, medical mystery, body horror, and sibling devotion into a haunting story about healing, sacrifice, and the strange kingdoms we carry inside ourselves. Perfect for readers who enjoy dark fantasy, gothic adventure, biological horror, magical medicine, and high-stakes journeys into hidden worlds.