A curious historian and a skilled assassin from Renaissance Italy must navigate treacherous political alliances and dangerous secrets to prevent a conspiracy that threatens to alter the course of history, only to discover that their actions have created a new timeline, forcing them to protect the fragile history they once knew.
Protagonist: A curious and adventurous historian who accidentally discovers the key to time-travel; Deuteragonist: A skilled and enigmatic assassin from Renaissance Italy who reluctantly helps the protagonist navigate the dangers of the era.
The protagonist and deuteragonist uncover a conspiracy that threatens to alter the course of history, forcing them to navigate treacherous political alliances and dangerous secrets in order to prevent catastrophic changes to the timeline.
In the climax, the protagonist and deuteragonist successfully thwart the conspiracy and return to their own time, having formed a deep bond and understanding of each other's worlds. As they part ways, they both carry with them the knowledge that history is fragile and must be protected at all costs.
Twist: Upon returning to their own time, the protagonist realizes that the conspiracy they thwarted has actually altered the course of history, creating a new timeline. The deuteragonist, now a part of the protagonist's time, must navigate this unfamiliar world while they work together to protect the fragile history they once knew.