Selkie Cove - The Ingenious Mechanical Devices, #5

Immanuel never liked being the museum's resident seal expert, until a strange specimen arrived: part human, part seal, and a murder victim. He knows the only people who will believe him are the supernatural agents of Her Majesty's Interceptors. But all help comes with a price. To become a member of the Interceptors, Immanuel must first convince his lover, Adam, to help him find the culprit. They have a week to uncover the killer or Immanuel will lose the only chance he has to learn about his own arcane abilities.
Upon arriving at Seolh-wiga Island, Adam and Immanuel quickly discover that what the island lacks in size, it makes up for in mysteries. At the heart of it all is a series of disappearances, murders, and devices connected to the island's sordid history. Will Adam and Immanuel earn a place with the Interceptors? Or will they become the island's next victims?