Angelmass, by Timothy Zahn

Angelmass has more hard science fiction in it than Spinneret, which I previously reviewed. The science is part and parcel of the plot, though, and works extremely well.

Zahn does a great job with characterization, as always, and brings together a cast of misfits to solve the mystery of the angels. Angels are subatomic particles harvested from the vicinity of a particular black hole that have the odd property of encouraging moral behavior of the people around them. Pretty soon all the politicians are forced to wear angels, reducing corruption in government.

Everything should be wonderful, but the neighboring space empire considers the angels to be the first part of an alien takeover of humanity, and intends to stop it. In addition, there are some hints that angels aren't perfect.

Into this scenario comes a scientist turned spy and a con-girl turned angel hunter. Together they unravel the secrets of the angels, which turns out to be entirely different than anyone expected.

If you like your science hard, but without the math, Angelmass is a fun read.