John Polidori, Lord Byron's secretary, sails with his master and his friends - the Shelleys - to a certain island. Soon Polidori begins to receive strange letters from a stranger who claims that she has been waiting for his arrival for a long time. It turns out that she is one of three twin sisters, but if her sisters are beauties and socialites, then she is a real monster, both literally and figuratively. The sisters support the barely glimmering life in her in a very original way... How exactly? This is where a terrible secret begins to be revealed...