In that neat style, "The Seventh" is not only No 7 in the Parker series, but also deals with 7 crooks sharing loot 7 ways and when someone outside the system screws up - how that seven becomes meaningless...well, till the end because nothing screws up for Parker on a permanent level.
And that is the beauty of the Parker series. It reads like oatmeal every morning and you are always happy after the meal. It is sort of the perfect airplane read but without the guilt - because these books are superb. To review them as separate titles is almost pointless, because really, they're the same novel. Parker is a man with little emotion but highly professional. He is part of a group stealing something (and that something has really no importance) and the fun of the novels is watching how the heist falls apart. In other words the heist or crime always fail on the grand picture, although Parker sometimes wins in the end.
So the novels are about how the failure happens, who screws up, who talks to the wrong person, and how they do their business. There are few surprises in the series which is why it is almost a trust-worthy no money back sure thing that you are getting your value out of these novels.
So yeah, its almost genius like in how Donald Westlake (Richard Stark) writes these perfect narrations on an on-going basis. But alas, he does and we the reader are thankful in a world that is falling apart - at the very least we can expect another Parker novel that will again say "things are alright in the heist world."