’He went to war,’ the fighter pilot with the golden mustache surmised.
’No, I suppose not,’ Colonel Cathcart surmised vaguely with the look of somebody seasick.
There are no more uses of "surmise" in the book.
Show samples from other sources
He has surmised that this is not a friendly visit.
Colleen Hoover -- Slammed
After texting his mom, he started the truck and peeled out of the parking lot, making it back to the ranch a little after four a.m. Seeing the lights on in the main house, he surmised that his mom had either risen early or. more likely, hadn’t gone to bed.