When his grand-nephew is killed, 91-year-old Ptolemy Grey becomes too suspicious of anyone else to allow them into his life. Teenaged Robyn, however, will not tolerate Ptolemy's hermitlike existence, and she challenges him to battle the dementia that threatens his well-being. Inspiring the 2022 Apple TV series starring Samuel L. Jackson, this novel follows Ptolemy as he takes an experimental drug that gives him vigor and clarity—with a price. What the rejuvenated Ptolemy finds in his own past and in the circumstances surrounding his grand-nephew's death spurs him to action, and to ensure a legacy that no one will forget.