5 Books Found

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Based on your description:

"Series that is 4 stories with some of the same characters. First book has a female character who is a red head and she has the power of death and shes the kings assassin. She meets someone who needs her to rescue his uncle.his name is Po"

June 21, 2026

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Likely answer

Young Adult Fantasy Novels in the Graceling Realm Series

The series you are describing is the Graceling Realm by Kristin Cashore. The first book, "Graceling", features Katsa, a red-haired assassin with the Grace of killing who serves King Randa. She meets Prince Po, who seeks her help to rescue his kidnapped grandfather (Tealiff). The original series consists of the companion novels "Graceling", "Fire", "Bitterblue", and the later addition "Winterkeep".

Confirmed match: Graceling by Kristin Cashore