Why mermaids sing

In 1811, murder has jarred London's elite. The sons of prominent families have been found at dawn in public places, their bodies mutilated and strange objects stuffed into their mouths. Although Sebastian St. Cyr is distracted by his seemingly doomed relationship with actress Kat Boleyn, the oddness of these murders nags at him-and he becomes determined to track down the assassin, even at the risk of his own life.