An excellent start to what will hopefully be a long-running series. The plot grabs you from the very beginning and pulls you along on a ride through the secret supernatural side of L.A. Lennon's use of specific real landmarks helps to ground the story in reality, and make the fantastical feel just a little more familiar.
In a story such as this one, with technological devices being so important to the plot, the right mix of techno-babble is paramount, and "Soul Trapper" hits it on the head: enough explanation to make it feel plausible, while still being brief enough to not require too much justification.
Kane is a great protagonist: emotional, complicated, and human. He makes mistakes, is abrasive even on his best days, and seems to have his foot permanently lodged in his mouth, which is why he's so enjoyable as a character. This is no Clark Kent, but a realistic, flawed human being that we can relate to.
The book's end resolves the main plot thread, and nothing else, which is both exciting and frustrating, in that we have to wait for the next book to find out more about Kane, his troubled past, and his uncertain future.