Shadowed hands is the final book of the Mortgatha trilogy, and the best.
As the book begins, darkness is stronger than ever, entering even Earth. The way to Mortgatha is barred, dividing the main characters. The 'good guys' are on the back foot, struggling to understand what is happening, and what to do about it.
As in the previous books of the series, the characters are sympathetic and believable. This is especially true of Clarie, who is changing as she struggles with darkness in her life. The aliens are sufficiently alien to be alien.
I found this a most enjoyable book, and I was reaching for my kindle tablet at every opportune moment to find out what would happen next.