The Sinking City Quid Pro Quo case guide

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One more for your casebook.

We’re in deep, continuing our The Sinking City main case guide series with its third case, Quid Pro Quo.

As per usual, spoilers lie ahead: continue at your own will.

Case #2: Lost at Sea | Case #3: Quid Pro Quo | Case #4: Fathers and Sons

  • First, go to the Oakmont Police Station.
    • Violent Crimes
    • Instruments of Crime.
    • Suspects.
  • Using the archives, select the expedition’s fate as evidence, then:
  • This will point you to the Fish Market in The Shells.
  • Go and speak to Anna.
  • She’ll point you to Fish Storage (The Shells, Hawking Lane between Warren Rd and Liberty Rd).
  • Speak to the guard and give him the password from Anna.
  • Kill all the enemies, then inspect all the evidence.
  • Walk through the portal and piece together the timeline:
    • 1: Man checking fish.
    • 2: Man checking the other fish location.
    • 3: Guard on the second floor.
    • 4: Guard throwing the harpoon.
  • Speak to the guard.
  • Speak with Anna at the Fish Market. Betray the guard for (Achievement/Trophy: Brutal Honesty).
  • Head to Oakmont University (Reed Heights). Speak with the man at the locked door to learn of the Department of Medicine.
  • Head there — it’s just down the road — and speak with the man at the counter.
  • Clear the enemies from the basement as the man asks.
  • Inspect everything, and then click the red button near a door a couple times to unlock (Achievement/Trophy: Reanimator). Try to kill the big bad, or just flee like I did.
  • Go the 2nd floor and check all items. Use your Mind’s Eye behind Professor Cavendish’s desk.
  • Head to Oakmont City Hall and use its archives to find Cavendish:
    • Residents
    • Records
    • Advent.
  • Head to find Cavendish’s house (Advent; Michael’s Road, between Carpenter Street and Constitution Street).
  • Examine all clues.
  • Walk through the portal to sort the timeline:
    • 1: “I have something to tell you.”
    • 2: Fighting in the kitchen.
    • 3: Fighting near the front door.
  • Speak to Cavendish when he comes in.
  • Head to your Mind Palace and make a conclusion. I chose the Professor’s side for (Achievement/Trophy: Compliments to the Chef).
  • To side with Cavendish, head back to Fish Storage and speak with the guard to get in (if he’s there, that is).
  • Poison the fish crates.
  • Speak to Cavendish, who is nearby.
  • To go the Fish Market and speak with Fred in the basement.
  • Head to the Throgmorton Manor and speak with Robert to finish the case.
  • I poisoned the fish crates and I spoke to Cavendish once more.

Case closed! Next, Fathers and Sons.

The Sinking City is available on Windows PC, Xbox One and PS4. We reviewed it here.