Ben knows only three things about his dad: 1) he has green eyes, 2) he has a number, and 3) at one point in his life, he made a deposit at a bank. Ben's mom is usually good about answering his questions. But not this one. So when Ben is assigned a family tree project at school, he confronts his mom (for the zillionth time), and instead of telling Ben the truth, she buys him a dog (Blue). With the dreaded day of oral reports looming, Ben rallies Blue and his best friend Cooper to uncover his dad's whereabouts and complete his family tree. But what Ben discovers is stranger than anything he could have ever imagined.