This is the second in the series set on the remote planet of Harmony, which was colonised from Earth before being cut off by the closure of the energy cloud called the Curtain, which had enabled such far distant travel. Two centuries later, Harmony has returned to about the level of 20th century Earth technology, but with various important differences, due to the development of psychic abilities among the colonists. 
 The sequel to 'After Dark', this book stars the two main characters of the first volume, Lydia Smith and Emmett London. A couple of months have passed and they are dating, though not totally over the prickliness which marked their relationship previously. This isn't helped by the attempted assassination of Mercer Wyatt, head of the ghost hunter Guild, early in the story, and Emmett's temporary appointment as acting Guild head. Given Lydia's grudge against ghost hunters - the testimony of two of them after she was lost underground for two days was instrumental in getting her fired from a career she loved - she worries that Emmett will be pushed into taking the job permanently, and has graver concerns that he will be the next target. 
 As with the first story, this begins with them finding a dead body, this time of an ex- professor who had phoned Lydia saying he had important information about what happened to her during her Lost Weekend as she calls it. Conveniently, he has died of a drug overdose, but evidence eventually emerges which convince both Lydia and Emmett that someone wanted to silence him. Bodies start to pile up, with a strange connection to the supposed deaths of some rather odd people a decade or more previously, as well as to the century ago rebellion, led by a man called Vance, who tried to use his own private army to take over Harmony. It was that conflict which led to the setting up of ghost hunter Guilds in each city and town, as private militia. These days, the Guilds handle training of youngsters - mostly boys - who exhibit the ability to deresonate the dangerous green energy clouds which form a hazard to anyone exploring the catacombs under the alien ruins each city and town has been built around, and also rents out the services of adult ghost hunters to protect official expeditions like the one on which Lydia was lost. 
 As with book 1, the murder mystery and the characters' own conflicts are interwoven, plus the appearances of a cute furry animal - known as a dust bunny - which has adopted Lydia. The final scene which stars him and a female of the species is the most cute in the book. I did find though that the shopping scenes were a bit tedious - Lydia has a friend who guides her in what to buy for her various social occasions - and slowed down the story. There are misunderstandings between Lydia and Emmett who turns out to have a romantic side she didn't appreciate. As the relationship has now been consummated, there is a little too much low level description of plumbing for my taste; less is more really or sex scenes can become farcical. A good read on the whole, but not spectacular, so it merits 3 stars from me.