Arthur Pendelton was eighteen years old when his final diagnosis stole his future. Desperate, humiliated, and with his health fading, Arthur did the unthinkable: he summoned Azael, the brother of the Demon King. Faced with the entity's cold disdain—seeing in Arthur nothing more than a weak soul and impure blood—the young man begged for just twenty more years of life. Azael accepted the pact with a cruel sense of amusement: he would grant Arthur his own vital force to sustain him, but in exchange, the human would have to "pay the debt" through intimacy, once every month. What began as a transaction for survival became an invisible thread binding a dying mortal to an immortal creature. Over two decades, Arthur desperately tried to build a normal life—pursuing his studies, marriage, and the illusion of a home—while Azael, like a silent and indifferent shadow, observed his human "investment." But twenty years is a long time to keep a heart guarded. As Arthur’s life crumbles under the weight of human betrayals that only Azael is aware of, the boundary between contract and affection begins to dissolve. Is it possible to share one’s own vital force, night after night, for twenty years, without the connection turning into an emotional sentence? And when the contract’s deadline finally expires, will the demon be prepared to let his mortal anchor go, or will the pact have sealed a fate from which neither of them can escape?

Sangue & Mercúrio conta a história de uma jovem mulher que entra para o mundo do narcotráfico como uma detective junior com o objectivo de um dia encontrar o assassino da sua irmã gêmea. Visto que o Middlesbrough era uma cidade governada e gerida pela máfia, era mais fácil encontrar seis gângsteres num universo de dez pessoas tanto que Alexandria se envolve com um mafioso sem saber quem ele realmente era. Ela vai se relacionando com Cassidy Hills e mais tarde ela descobre que o mesmo para além de ser um gângster podia ser o provável assassino de sua irmã gêmea. Como Alexandria podia fazer isso, continuar a se envolver com a Hills e suposto assassino de sua irmã? E para Hills, como podia ele se envolver com uma policial, mesmo sabendo que isso ia contra um dos mandamentos da máfia? O quão longe ambos poderiam ir contra os seus princípios por amor?

Kim, a woman who lost her memory saves a mercenary named Tadeu Tavares. In gratitude, Tadeu takes her to the base where he lives. Along the way many ( strange?) things happen. Three days after their arrival, the base is attacked, Kim is forced to join the others in the fight against the aliens and at the same time to find out who she really is.