Seventeen-year-old Hannah thought she hated her kid sister Leslie until she lost her in a tragic accident—but was it an accident? Leslie drowned even though she knew how to swim, and something seems wrong about the whole thing. Hannah lives in a world where it's possible to relive memories on a screen at Memory Lane. The price is that, once seen, you lose that memory forever, and it becomes the property of Memory Lane. Desperate for answers, Hannah sneaks into the facility, but her experience raises even more questions and concerns. Now on the run with her cousin Thomas, Hannah discovers an organized group of rebels known as the Memorizers. The group is against Memory Lane stealing memories and is willing to fight for their beliefs. The Memorizers could be necessary assets in Hannah discovering the truth about Leslie. Will Hannah and Thomas join them or fight Memory Lane on their own? Most importantly, can Hannah trust her own memories?