Timebound by Rysa Walker

A teenage girl discovers she can jump through time and is drawn into a hidden battle over who controls history: a secret organization that enforces the timeline versus forces who would rewrite it. As she learns the rules and costs of temporal travel, she must decide whether to accept the group's strictures or risk altering the past to save the people she loves, setting off a tense, twist-filled struggle with dangerous enemies and moral consequences.

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