What is the overall theme of chasing lincoln's killer?

Planning, Conspiracy and the Unexpected.

Explanation:

Chasing Lincoln’s Killer is a description of a conspiracy for the president to be killed and it also shows how vital historical events are usually the result of both luck and unpredictable circumstances.

For example, we can deduce that Lincoln could have been harmed by John Wilkes Booth Lincoln earlier at the inauguration speech if the president, had Booth taken his opportunity. Thus indicates that planning is important and we should be ready to take opportunities whenever we are presented with them.

In the end though, Booth assassinated the president through some stroke of luck he got as he found out unexpectedly that Lincoln was going to go to Ford's Theater to watch a play which was where he assassinated him.

it is a part of john locke's natural rights popular during the age of enlightenment that people had inalienable rights to life, liberty and property. this was reflected by thomas jefferson in his declaration of independence as rights to life,liberty and the pursuit of happiness.

another line in the declaration of independence is that people have certain rights just because they are human. humans are capable of obeying the three natural rights john locke mentioned making them governable by these laws and therefore entitled to these rights as well.