V Is For Vengeance by Sue Grafton

A tough, private investigator in 1980s California takes on what seems like a routine assignment and soon finds herself entangled in a web of secrets, deceit and escalating violence; as she follows leads through a maze of lies, she uncovers long-buried grudges and calculated retribution that threaten innocent lives and forces her to confront the limits of justice and her own resilience.

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