It seems Dandelion hasn’t spared Priscilla any details about telling her your story, but you’re here on more important matters than your love life. Priscilla tells you Dandelion has planned a heist against an underworld boss named Sigi Reuven, but hasn’t been seen since. He’s definitely crossed Whoreson Junior (the biggest metaphorical prick in Novigrad), and another of the four bosses that controls the seething underbelly of the city (the others are Carlo “Cleaver” Varese and the King of Beggars). As the quest concludes, you decide that finding Whoreson and Sigi Reuven are your best options.
The Witcher 3: Wild Hunt eGuide Quest Walkthrough: Act I (Novigrad) Main Quest: Broken Flowers