I really love that the author has found a way to weave in and out of different times within Jack Reacher's life throughout the series in a completely non-linear way. I sit in awe of Lee Child's ability to mastermind writing a series with that concept cooking. We never know what era of Reacher's life Lee is going to pop us into next, but I've loved every snapshot he's given us.
What I liked best about Deep Down was the way the author plunks Reacher into an uncomfortable political situation, on a mission to unearth a rat without ticking off any of the politicians that the Army is attempting to sway to approve new ammunitions. Even though it's a 'short', Lee makes Reacher have to think and fight in his classic Reacher way.
DEEP DOWN was an easy E-read because of the length. I highly recommend it to all Reacher lovers.