Sir Percy Blakeney Is the Scarlet One
Puzzle 5 of Common Dreams Hard Pack
Question is: Sir Percy Blakeney Is the Scarlet One
and the answer is: PIMPERNEL
Word Meaning:
PIMPERNEL — (now rare) A plant of the genus Pimpinella, especially burnet saxifrage (Pimpinella saxifraga).
Definitions from Wiktionary.