The knock came late.Marcus Hale didn't open the door.When a troubled neighbor begins asking questions about a night no one wants to remember, Marcus tells himself he's done nothing wrong. He didn't cause harm. He didn't interfere. He simply stayed quiet.But silence has consequences.As concern turns into suspicion-and suspicion into official records-Marcus watches a system built for safety begin to erase a man who doesn't fit. Each step feels reasonable. Each choice defensible. And each decision moves Marcus closer to a truth he refuses to face.Because doing nothing is still a choice.Neighbor Who Knew Too Much is a quiet psychological thriller about moral responsibility, institutional power, and the cost of looking away-perfect for readers who prefer tension over twists and dread over action.Sometimes the most dangerous people are the ones who never raise their voices.