Meira Domonic is killed in the inner city. There are no witnesses, but her brothers-in-arms know exactly how she died and what killed her. They mourn her loss and move on, the world seeming a little grimmer, a little darker as they continue their fight.
For Meiras sister Hunter Michael Domonic and for Commander Simon Bishop of the Angelline Order, her death is something more and not just because of their feelings for her. The once-human that killed her is more powerful than any other in the history of the Angelline Order for, when Taint stripped it of its humanity, it left not mere predatory instinct, but dark intelligence and abilities.
For her brother Amon, special employee of Darksun International the largest corporation no ones ever heard of it is but another step into the dark world of Taint that lurks beneath our own. Each question he asks about his sisters mysterious death leads him deeper into that world, and chillingly, Darksun seems to know all the answers.
Michaels rescue of a little girl named Suzie may be the key to their search or the key to the door that keeps the floodgates of Taint from bursting and enveloping the world in its dark corruption. Suzies nightmare visions tell them that somehow the Tainted One that killed Meira is the most dangerous creature that has ever walked the Earth. It must be found before it finds Suzie and makes Suzies dark visions a reality
You lead a hook with a character who's dead? Uhh...no.
Who's the main character? It seems to be Suzie since the's the one the bad guy wants to chomp on. Whomever it is, start with them. Then give us more about the forces oppposing them.
"most dangerous creature that ever walked the earth" is hyperbolic blather and it doesn't work. Scary is what's known and immediate.