I think I found it! "Defenders of Shadow and Light" checking if it's on Amazon...
Edit: sure is! https://www.amazon.com/dp/B01M1M0UU9/ref=cm_sw_r_cp_apa_FxXwFbK1D7XRS
Hopefully this is the right one, especially since I bought it lol
Defenders of Shadow and Light: Ghost Thief tells the story of Murray Gastev - a thief for hire and a good one at that. He completes his latest job but ends up with far more than just the cash he expected to receive. He finds he now has the ability to pass through walls and float. There are just two small problems: He can't breathe while he 'ghosts' and he can't control where he floats to. With the help of some new friends, Murray might learn to control his powers and may even pull off his biggest heist yet. If he doesn't end up being sliced to ribbons first.
I'm currently giving away a signed copy of the book on my blog and am having a Black Friday/Cyber Monday sale for the Kindle version of my book: $1.99 (normal price is $4.99).