An alcoholic jeweler whose collection is used as bait for Flannelfoot. He is secretly the mastermind behind the thefts, having hired the thief in Berlin and England, but is killed by Flannelfoot to prevent him from being exposed.
Neilson's past employment of the thief indirectly leads to Ginger's assassination.
Wexford recruits Neilson to supply valuable jewels as a trap for the thief.
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