Let me introduce myself: Sheni, an ordinary librarian, a modest guy and a quiet person, who has never hurt a fly in his life. Indeed, why offend flies if I have larger victims planned? After all, I spend my free time not reading books, but fulfilling orders from the guild of assassins. However, now I have a truly dangerous opponent. Black dragons, deadly curses, spellcasters and murder mysteries. A lot of intrigues are intertwined into one tight knot, which only I can cut. However, is it worth engaging in a fight with an unknown cruel enemy if you risk paying for victory with the life of a loved one?