The third-level plot concerns the uncle of Mistress Peregrine and Jacinta, Sir Solitary Plot, "a character compounded of Jonson's Morose in Epicene and Jonson's Sir Politic Would-Be in Volpone."
The third-level plot includes Sir Solitary Plot, who is related to Mistress Peregrine and Jacinta. This character is based on the fusion of Jonson's Morose from Epicene and Jonson's Sir Politic Would-Be from Volpone.