Lost Souls wraps up the story of Kiyoshi Ishibe which began in Blood Brothers and developed in other books part of the Dragon's Disciple series. Kiyoshi's relationship with Nakamura Ryuhei is related in Soul of the Night.
As I read Lost Souls, I admit to being biased against Jesse Shigeta a young man gifted with musical talents and the ability to see and interact with Kiyoshi's tormented spirit who longs for Ryuhei. Although Jesse insists he is not simply a fan of Nakamura Ryuhei, a famous musician now music executive, he has fallen in love with Ryuhei through the relationship Kiyoshi narrated to him over the years.
Jesse is given the opportunity to study at Ryuhei's institute in Tokyo where his original intent to assist Kiyoshi find the musician turns into a vicious love triangle. To me, Jesse was nothing more than a selfish-brat who overlooked his friendship with Kiyoshi's ghost to indulge in his infatuation with Ryuhei. The young man easily sensed Ryuhei's vulnerability due to the century apart from Kiyoshi and decides he can replace the musician's lost love...
Paranormal researchers Matt Gavin and Haku Nishimura* arrive in Tokyo and meet with Jesse to pursue a new case and enters into a situation which will test their abilities.
The story is full of twists and turns, betrayal and a spectacular ending for our favorite vampires.

*Matt and Haku have their own adventure in Parallel Process.