This cover is called Poisoned.

Description:
A huge family is living a normal, happy life in Chicago. But then, the population begins to decrease. Families at a time. Doctors find poison inside the bodies. No one knows when the killer will strike, or who is the next victim. The family must try to solve the mystery in order to save the town, let alone, themselves. But when they find out that they are the next family in the list, what will they do?

The category is mystery/thriller.

K, guys, I know this one is similar to the Safari thing-a-ma-bobber, but this way, if 2 people want to do the same type of story using my covers, they can. So please please please claim a cover. I want them to go!