Shortly after killing a kindergarten teacher about to marry, a sniper kills a lawyer on a Manhattan street, without an apparent link. Esposito's sharp-shooter training proves handy for the case and to help Becket deal with the rekindled trauma of her near-fatal shooting. With help from his daughter's art course, Castle works out the only clues left at the distant sniper hideouts, cuttings from Renaissance paintings. Each alludes to the next murder site. After a third target survives, Castle works out a superficial point in common and postulates a tragic motive.
—KGF Vissers