Who is Lionel Spragge from The Eye in the Door and what is their importance?

Lionel Spragge works as an unofficial investigator for Major Lode and the Intelligence Unit at the Ministry of Munitions. The narrative describes Spragge as "a big, fleshy, floridly handsome man" (46). Spragge has very thick eyebrows and beautiful blue-green eyes. Lionel Spragge has a thick neck and thick jowls. Spragge is tall and burly and has hair growing "from his ears, his nostrils, and from under his shirt cuffs" (46). Spragge is known for his underhanded methods of investigating. Spragge lied to Beattie Roper in order to frame Beattie for conspiring to assassinate Prime Minister David Lloyd George. Spragge drinks quite a lot. And while he is a man of some size, Billy Prior finds out that Spragge is not a menacing as he pretends to be.