context: Simon Miller (Loren Dean) outwardly appears to be a geologist who must frequently take business trips, which has strained the relationship with his family, including his wife Meredith (Robyn Lively) and teenage children Sarah (Skyler Day) and Kevin (Drew Koles). When Simon suddenly goes missing, his family searches his office and discovers several passports, each with different aliases. They soon learn that Simon was in fact a spy who kept his true career secret from them. Simon mysteriously calls home and warns his family not to tell anyone about his disappearances, then abruptly hangs up. His family begins a search for Simon, which takes them to locations around the world. Sarah, an honor student, uses her foreign language skills to help, and Kevin uses his knowledge of technology.[1] They receive assistance from Amanda (Christine Baranski), another covert operative who initially appears to be a friend, but appears to have her own motives.[2]
question: Why do they think the passports are suspicious?
answer: The passports have different aliases.