The Water Room by Christopher Fowler

In this intriguing mystery, the eccentric detectives of the Peculiar Crimes Unit, Arthur Bryant and John May, are called to investigate the mysterious death of an elderly woman found drowned in her own basement, despite no apparent source of water. As they delve deeper into the case, they uncover a labyrinth of secrets hidden beneath London's streets, where ancient rivers and forgotten histories intertwine with modern-day crimes. With their unique blend of wit, intuition, and unconventional methods, Bryant and May navigate a web of deception, leading them to a surprising and chilling conclusion.