An elderly man appears to be losing his mind, but Steve and Liz are determined to prove that he doesn't need to go into a home. Vernon is frustrated when he's called to jury service, leaving David with an impossible work schedule to juggle.

Steve finds himself in trouble when a maid at Ashfordly Hall takes more than a shine to him. David invents a novel way to rid the estate of moles, and makes a new friend in the process.