An element of danger. When Massachusetts Congresswoman Margaret Hurley is killed by a hit-and-run driver, speculation on the "accident" intrigues the sharp mind of Gloria Lamerino. A physicist turned forensic expert for the Revere police, she notes that the victim died just before she was to cast a critical vote regarding the government helium reserves. Aware of the promising use of helium in cutting-edge technologies, Gloria's suspicion falls on the CEO of a software company, reaping big profits from the helium mining operation. But another murder leads her to wonder if the crimes may be of a more personal nature. Working feverishly to decipher the clue the victim left, Gloria makes the stunning connection between the truth and the killer -- an equation for murder that may prove fatal.