Answer:
Isabel discovers that the Locktons are bribing rebels for the Loyalists cause, and the money is hidden in a walnut chest that Madam hid from inspection at the docks in order to conceal from inspection. And surely Isabel hears something important.
Step-by-step explanation:
Pages 87 and 88 tell us how Lockton and his friends describe how hard it is for them to bribe rebels. We see that rebels don't care for money and these huge pieces of land being offered to them by the king