Why did Turtle stare at Sydelle?

Turtle stared at Sydelle because she'd caught her mistake.

“This looks professional, all right. The typing is perfect— well, almost perfect. It seems you left out the last word in section three:
The estate is at the crossroads.
The heir who wins the windfall will
be the one who finds the
“Finds the what, Ms. Pulaski? Finds the what?”
Sydelle squirmed under Turtle’s hard stare. Leave it to the brat to discover my one error. “There was so much talking I couldn’t hear the last word.”