Transported to the alien world of Ptallaya by a strange and terrifying ritual, Victorian missionary Aiden Fleischer and his brilliant but damaged assistant Clarissa Stark are stranded. Befriended by the Yatsill, a race of bizarre telepathic alien mimics, the travellers watch in amazement as the society around them transforms into a parody of London. But as the dual yellow suns of this new world slowly set, a red sun is also rising, and with it come the Blood Gods, an ancient and indestructible evil...