In Echofall, memories can be extracted and bottled like perfume. The rich preserve their happiest moments while the desperate sell fragments of their past for cash. Detective Iris Kane investigates when a black market memory dealer is found murdered, his entire inventory erased. But the killer left one memory behind: a bottled confession showing Iris committing a murder she has no recollection of. Now she has seventy-two hours to prove her innocence by finding memories she never knew she lost.