Out Law is a novella in the Dresden Files series, an urban fantasy franchise in which wizard Harry Dresden protects Chicago from supernatural threats. The story takes place after the main novels, in a city still recovering from a catastrophic supernatural battle.
Before dawn, the magical ward-flames of Harry's castle signal a powerful presence outside. Harry arms himself and steps out to find Gentleman John Marcone, Baron of Chicago, the kingpin of the city's criminal underworld and a Knight of the Blackened Denarius, a mortal allied with a Fallen angel. Marcone reminds Harry of two debts: one for sheltering civilians during the Battle of Chicago, and another for saving Harry's life afterward. Rather than settle through Mab, Queen of the fae Unseelie Court and Harry's liege, Marcone proposes a private deal. He asks Harry, who serves Mab as her Winter Knight, her sworn mortal champion, to help one of his underlings leave the criminal world and go legitimate. If Harry does this, the debts are cleared.
From a waiting limousine steps Tripp Gregory, a petty criminal Harry despises for once filing a predatory lawsuit against a benevolent tutoring service. Marcone challenges Harry's principles, asking whether they apply only to people Harry likes, and departs.
Harry sits down with Tripp, who tells his story. Men from a narcotics gang in St. Louis kidnapped him for execution. Facing death, Tripp prayed, promising God he would change if he survived. The gun misfired, and Tripp escaped into a river. Since then, he has started Kid Power!, a children's charity for Chicago kids whose education suffered after prolonged school closures following the Battle. He received startup funding from an elderly donor named Adeline Hathaway, now deceased, but government agencies have gotten involved. Harry decides they need a lawyer.
Harry takes Tripp to Max Valerious, his trusted elderly attorney, whose wife, Heloise, a retired forensic accountant, reviews Tripp's records. Max identifies several crises: Hathaway's heir, Norman Hathaway, seeks a temporary restraining order to freeze Kid Power's funds and press charges for financial exploitation. Constance Abernathy, a relentless Internal Revenue Service (IRS) agent, has also targeted Tripp. Worse, Tripp paid himself most of the two-million-dollar donation as a bonus, then bet it illegally through a bookie named Estevez. Tripp won 10 million dollars, but Estevez refuses to pay. With no money and only Tripp's word, the situation is dire. They have one week before the hearing.
While Harry and Max confer, a hairless, emaciated mountain lion attacks Tripp outside. Harry blasts the creature with kinetic energy stored in his silver rings, and as it dies, it vomits out a gelatinous black mass that slithers into a storm drain. Max's basset hound, Peppermint, is wounded defending Tripp, and Max, furious that his family has been harmed, pledges full support.
Harry installs Tripp in the castle and sends Bear, his Valkyrie bodyguard, a supernatural warrior in the service of the Norse god Odin, to research Estevez. In his laboratory, Harry and his apprentice, Fitz, brew veil potions to mask Tripp from supernatural tracking. Research identifies the parasitic entity as the Lurker in the Shadows, an ancient demonic being that fragments itself to possess living creatures, feeds on blood, and is vulnerable to fire, blessed water, and sunlight.
Harry meets Estevez at Columbus Park and gives him three days to produce the money, threatening to destroy the Lurker and expose Estevez as a cheat. Estevez's bodyguard, Emilio, who radiates the Lurker's presence, thanks Harry for the deadline with unsettling eagerness.
On the legal front, Norman Hathaway refuses any compromise, and Max admits their odds of defeating the restraining order are only one in three. To move Tripp safely to a meeting with Abernathy, Harry devises a decoy: Fitz dons Tripp's bloodied suit and casts an illusion, drawing the Lurker's attention while Harry and the real Tripp slip out the back. At the IRS office, Max argues that Kid Power would generate far more tax revenue over 30 years than prosecution would recover. When Abernathy demands sincerity, Tripp drops his salesman persona and tells her about the misfired gun and his promise to God. Abernathy conditionally agrees to recommend against prosecution, provided the winnings are recovered, taxed, and returned to the charity, with Max and Heloise overseeing the finances.
After the meeting, Emilio ambushes Harry and Tripp in a parking garage with Lurker-possessed cats and crows. The Lurker speaks through Emilio, revealing it was once enslaved by the Red Court of vampires. Emilio shatters Harry's shield with corrosive black magic. Tripp saves Harry by kicking through the swarming animals and shoving him into the car. A Lurker tendril forces its way through the air vent; Tripp drives into sunlight, and the tendril bursts into flames.
The Lurker also infects Fitz during the decoy mission through a possessed crow. At the castle, Harry finds Fitz drinking blood from raw meat, intoxicated by amplified magical power. Harry uses analytical questioning to engage Fitz's rational mind, then lets him choose to drink holy water rather than forcing it. The violent purging expels the Lurker. Harry consults Bob the Skull, a spirit of intellect who serves as his arcane advisor. Bob reveals the Lurker is the less-evolved sibling of the demon behind the Red Court of vampires. The Red Court was a vampire civilization that Harry destroyed years earlier to save his daughter, inadvertently freeing the Lurker. Because it is a distributed consciousness, the Lurker cannot be destroyed conventionally but can be contained. Harry formulates a plan involving Demonreach, a supernatural prison island in Lake Michigan where he serves as Warden.
Tripp stays at Fitz's bedside through the night, acknowledging that what happened is partly his fault. Harry, enraged that the Lurker harmed his apprentice, moves the confrontation up. He, Bear, and Tripp meet Estevez and Emilio at two AM at the Montrose Point Bird Sanctuary, a lakeside location Harry chose deliberately. Estevez presents suitcases of cash but offers Tripp a side deal: Take one suitcase and disappear overseas. Tripp, visibly tempted, pushes the suitcase back and demands his full winnings.
Estevez reveals this was never going to end peacefully. Emilio summons Lurker-possessed baboons. Harry deploys fire and enchanted handkerchiefs of captured sunlight to blind the creatures. Bear fights with club and shield. Estevez shoots Tripp in the back, but protection spells in Fitz's borrowed motorcycle leathers stop the bullet. Emilio's magic destroys Harry's shield, and the combatants crash into Lake Michigan, exactly where Harry wants them.
Underwater, Harry calls upon Alfred, the spirit of Demonreach. Glowing roots seize the Lurker tendrils, extract the parasite from the baboons, and rip it from Emilio. Stripped of the Lurker's power, Emilio ages rapidly as centuries of supernatural preservation dissolve. Alfred carries the captured fragments to the island prison. Harry surfaces to find Estevez aiming a pistol at his head. Before Estevez fires, Tripp brings his baseball bat down on the gangster's wrist, breaking it, and knocks him unconscious.
Harry dictates terms: They take the money and Tripp; Estevez stays out of Chicago and leaves the St. Louis gang uninformed. Harry leverages the captured Lurker fragments, threatening to locate and destroy the full entity. Estevez accepts.
The legal threats also collapse. Hathaway dismisses his restraining order after Max threatens an ethics investigation. Abernathy instructs the State's Attorney not to prosecute. Half the winnings go to taxes, with the rest funding Kid Power. Tripp declines the chance to disappear with the money, recognizing it would lead back to ruin. He insists Harry accept payment, but Harry refuses, saying the money belongs to the children.
Marcone returns the next morning, confirms the debt is settled, and probes about cooperating against the Lurker on a larger scale. Harry refuses, distinguishing between helping someone trying to be decent and assisting someone who is not. Harry tells Bear to get the car ready: They are taking Fitz and Tripp to meet Max and Heloise for beer and steak sandwiches.