The Witcher 3 Wild Hunt (PS4) - A Miraculous Guide to Gwent Book (St. Gregory's Bridge)
After the 1.20 update for The Witcher 3, the A Miraculous Guide to Gwent book can be bought from the shopkeeper merchant near the St. Gregory's Bridge signpost in Novigrad. The Gwent guide will reveal how many cards are missing from your total Gwent collection, how many cards are still to be found in each area of the game, and how many can be won randomly from Gwent players (merchants etc.).