This is Dr. Sleep by Stephen King/ It is The Shinning 2. 

It has one of the longest wait times in the history of books.

There was like 34 years in between parts 1 and 2. 

Danny is like 43 years old . His mom  is dead. He still has some

shinning left inside him and he uses it to help hopelessly Ill senors 

"pass in to the light" He works a shit job in a nursing home,

 so he has lots of clients to help. He doesn't seem to have much of a

 life , other the this.

 Then He runs into some bad guys.

Really evil senors who are called the "True knot".

 These guys are not human but appear to be just 

harmless senors citizens traveling through the 

USA in their plain, old RV's . They search for people

 with "the Shinning" and kid-nap them.

They use them , torture them, 

and some how 'consume' their powers.

The children with the Shinning some how 

'give off' food (power)as their being tortured, 

that these Evil-senior-RV-Monsters can eat .

At some point Danny and these monsters 

come across the same kid. 

Her name is Abra (as in abracadabra ) . 

The True Knot wants 12 year old Abra for food, 

Danny wants to save her...

so ...Hy'jinks ensue !

As you can see in the pic, Abra is like "Fading away"
 It is not clear why she is fading but she is, 
and Danny must save her before shes gone all together .

Why she seems to be an adult in the pic is also unclear.

You can youtube-search: Stephen kings reads Dr. sleep 
to hear him give an exert from the book