The Stash At The Archway

While about your business in Novigrad, be sure you head up this particular cobbled street, in The Bits and just northeast of the Kingfisher Inn), as you’ll spot two shady individuals fiddling with an area of ground near the wooden deck. They stride off. Ignore them, but instead use your Witcher Sense on the area to uncover a loose brick. Sure enough, this is a drop location. Gather the note they left behind.