7 Ate 9 (Volume 1) (Private I, 1)

"The clever numerical wordplay of this picture book make it enjoyable for readers in early elementary school who are old enough to understand the nuances of numbers." - Seira Wilson, Amazon Editor

6 has a problem.
Everyone knows that 7 is always after him. Word on the street is that 7 ate 9. If that's true, 6's days are numbered. Lucky for him, Private I is on the case. But the facts just don't add up.
It's odd.
Will Private I put two and two together and solve the problem . . . or is 6 next in line to be subtracted?