From DOI, page 15; John writing.

"The note says the kidnappers will be watching. Maybe I can catch them looking at us. I race upstarirs and find a pair of binoculars. I start looking up and down the street.
There's a strange vehicle in the alley behind the Barnhills', I note.
After several minutes of watching the vehicle, nothing happens so I finally go back downstairs. The phone rings. Everyone freezes as I slowly pick up the receiver."
(It was Rod Westmoreland, his banker.)