Mrs. Inglethorp is out, and he sits down to write to his accomplice, who, he fears, may be in a panic at the nonsuccess of their plan. 
His accomplice is actually very calm about the plan's failure.
mnli hypothesis: His accomplice is actually very calm about the plan's failure. premise: Mrs. Inglethorp is out, and he sits down to write to his accomplice, who, he fears, may be in a panic at the nonsuccess of their plan. 