Part bildungsroman and part psychological thriller, That Existential Leap is a novel of ideas about the struggle for self-realisation and belonging in the postmodern West. Claudette Dasgupta is a thoughtful but unremarkable American teenager unenthusiastic about the prospect of college and a conventional life. When she meets the heroically mysterious Siegfried at the New York Public Library, she barely hesitates to throw in her lot with him, but soon finds an unscripted life is scarier, and harder, than she could have imagined. Meanwhile, across the Atlantic in Siegfried's home town Glasgow, unconventional police detective Alexander investigates his disappearance. Alexander is soon caught up in still more unworldly affairs as his work spirals out of control and his personal life unravels. As the two stories wrap around one another, encompassing the worlds of crime and gangsterism, the law and police work, music and the supernatural, Dolan Cummings' novel explores the terrifying uncertainty at the core of all human relationships.