Heathcliff is my daughter-in-law,’ said Heathcliff, corroborating my surmise.
Ere long, I heard the click of the latch, and Catherine flew up-stairs, breathless and wild; too excited to show gladness: indeed, by her face, you would rather have surmised an awful calamity.
There are no more uses of "surmise" in the book.
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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.