1. The Mysterious "League": The very existence of the Red-Headed League, with its odd purpose and seemingly generous pay, raises suspicion from the start. This foreshadows the hidden agenda and the potential for deceit lurking behind the League's facade.
2. The Disappearance of Mr. Wilson: The abrupt disappearance of the League's founder, Mr. Wilson, creates an air of mystery and suggests something sinister is at play. This foreshadows the involvement of a criminal element and the potential danger to those connected to the League.
3. The Strange Behavior of the Landlord: The landlord's unusual behavior, including his insistence on staying in the house while the work is done, raises red flags. This foreshadows his potential involvement in the scheme and his knowledge of the League's true purpose.
4. The Underground Tunnel: The discovery of the tunnel beneath the pawn shop is a crucial clue, foreshadowing the underground activities and the use of the shop as a cover for illegal operations.
5. The Timed Work Schedule: The strict time-bound nature of the League's work schedule, particularly the requirement to be present at the office during the day, raises suspicion. This foreshadows the real purpose of the "work," which is to keep the pawn shop owner occupied while the criminals can freely operate.
6. The Increasingly Strange Circumstances: The increasing oddness of the events surrounding the League, such as the constant presence of "detectives" and the landlord's suspicious behavior, create a sense of mounting tension. This foreshadows the eventual revelation of the League's true purpose and the confrontation with the criminals.
These instances of foreshadowing effectively build suspense and keep the reader guessing about the true nature of the Red-Headed League and its sinister motives.