You need to find Dee’s letter in ZombiU to help Dr. Knight make the Panacea. Dr. Knight needs these letters to uncover the hidden symbols written in each letter. These symbols or codes are only visible in the Black Light. This type of code is referred to as Panacea Code or the missing codon for the creation of the vaccine.
You begin finding these letters at the start of the Mission #8. You aren’t required to find them all at once, you can find them during intervals or during any mission once you have been assigned the task.
If you are finding it difficult to locate these letters, follow our leads:
Location. Palace Underground – Royal Bunker
You will find it in the pass-through box between you and doctor. It will be given to you by the doctor at the end of the Mission #7.
Location. Victoria Memorial – Sewer
Look for it in the armory, inside the cell door in the side passage, down the steps from the Safe House door. You will need Waverley’s Keycard to unlock the cell door. Best time to get this letter is at the end of Mission #9.
Location. Brick Lane Flats – Old Brick Warehouses
You will find it inside the Cubbyhole behind a Raven’s Keypad door. You will need Prepper Pad Decipher upgrade. Best time to get letter is at the end of Mission #10.
Location. Brick Lane Markets – Hanbury Green And Market Street
You will find it behind a C4 trash pile, in the back garden near the alleyway between tenement flats. Best time to get it is during Mission #11. You will need C4 to get this letter.
Location. Spitalfields Green – Quaker Park
You will find it behind a large iron barricade, at the end of a series of backyards, in one corner of the park. You will need Prepper Pad Kaycard Hack to get this letter and best time to get it is at the end of Mission #11.
Location. Tower of London – Tower Pier
You will find it on the deck of a tugboat, connected by drawbridge to the second pier, on the Thames. You will need Prepper Pad Keycard Hack to get this letter and best time to get it is at the end of Mission #11.
Location. Baconfields – Darwin Yard
You will find it inside a small shed, close tot he wasteland pond and digging equipment. You will need Prepper Keycard Hack and best time to get it is at the end of Mission #11.