6. The Cost of Doing Business

Complete story — includes the ending

A sniper shoots nine people, killing four, in the financial district. Morland offers his help with the case, knowing the sniper's identity. Although the shooting appears random, it is too precise, concealing the true target; Morland knows of a prior mass shooting with the same modus operandi, which benefitted a former client. Shooter-for-hire Gagnier was paid by a shell subsidiary of Dynastic Energies. Gagnier dies in a fall when the police attempt to apprehend him. The CEO of Dynastic Energies, Bill Wellstone, was having an affair with his lawyer's wife, Sarah; he discovered that she had left him for plumber Frank Bova, the true target of the shooting. Wellstone used a golf bag to smuggle the sniper's weapon past the security protecting the building, but left behind gun oil residue in the bag that implicates him. Over dinner with Morland, his contact at Interpol, Lukas, says that Morland has not been helping Sherlock out of the goodness of his heart, but rather is risking Sherlock's life. Lukas demands 5 million euros from Morland for keeping Sherlock in the dark about something. Morland orders Lukas to return to France, implying that he had Lukas's Interpol predecessor killed for a similar transgression.