At the start of this fast-paced romantic thriller, the second from the bestselling mother and son Johansen team (Silent Thunder), Rachel Kirby, a computer whiz in Houston, Tex., is working hard to spur medical research on Krabbe's disease, a rare nervous-system disorder afflicting her sister, Allie. After Rachel narrowly survives a sniper's bullet, she receives an e-mail from John Tavak, a stranger who claims to be trapped in an Egyptian tomb, where he's met Peseshet, an ancient physician who may have a cure for Allie's ailment. The sisters set off on a globe-trotting adventure featuring gunfights, explosions and contrived romantic subplots. Rachel finds herself attracted to the enigmatic Tavak, while Allie starts falling for Hal Demanski, a spoiled billionaire who ends up aiding their efforts to get Peseshet's secrets before an evil pharmaceutical company does.