Getting More Worried By The Second

Confused, Derek holds his wife’s hands and sits her down in the coach. “What has happened Irene?” he asks, getting more and more worried by the second. It turns out that the man on the phone was supposedly a police officer.
According to the caller, the couple’s grandson had been arrested and to get him out, they needed to buy two Target cards. Feeling both scared and speechless, the couple looks at each other. What were they going to do?