“Dead Reckoning” (*1/2 out of four) was a sloppy action melodrama set around the time of the 2013 Boston Marathon bombing in which a hard-nosed F.B.I. agent (James Remar) is racing against time to to find the bomb and stop one of the terrorists (Scott Adkins) involved and a group of hapless partying kids (India Eisley, Sydney Park, and others) caught in the middle. Despite the subject matter, film only makes a superfluous connection to the 2013 bombing and is simply a generic and mindless action movie which runs out of steam quickly. For a sharper and stronger look at the Boston bombing, watch “Patriots Day” instead. The talented Remar deserves much better than this “dead” material.