The more I think about it, the less satisfied I am with the proposed outline I've got being the first in the series. I really like the beginning, how perfectly it sets the mood for the book (and by extension the series, if it were book one,) but from then on, the plot that collecting the Asset naturally leads to, it's just unfit unsatisfying as the first book of the series.
As time-tested a plot as "the molehunt" is, and the main character being the primary suspect as a matter of course, it creates too strong a promise for following books, drives too deep a wedge in between characters we've only just met. It just doesn't work, in other words. Not as a first book. But I think I've figured out, at least vague ready-to-be-fleshed-in versions for preceding books. It starts with the timeline for this one...