The enigmatic Tomomi "Butterfly" Ishikawa has just sent a cryptic suicide note to writer Benjamin Constable. She's planted a slew of clues, and Ben embarks upon a scavenger hunt leading to charming and unexpected spaces, from the hidden alleys of Paris to the cobblestone streets of New York City. But Butterfly's posthumous messages are surprisingly well informed for the words of a dead person, and they're full of confessions of a past darkened by insanity, betrayal, and murder. Now Ben must draw a clear line between the real and surreal if he is to save himself, Butterfly, and what remains of their friendship.