“Deep Shadow has it all—Suspense, Thriller… and a little bit of love. Sullivan is obviously a fan of the culture, climate, and diving in the Caribbean.  The way he described each island and each dive that they made is painted in this amazing color that I felt like I was there. I can also tell that a ton of research (and non-fiction elements) went into Deep Shadow… everything felt incredibly plausible. The characters were likable and easy to root for (especially Boone) - you just wanted them to do well and to come out on top. Overall, Deep Shadow will probably be up there with my Best of 2018 books. 5 out of 5 Stars.” 

"Nick Sullivan is the real thing. This is the new author to watch! Every damn sentence in Deep Shadow vibrates with authenticity — whether it’s diving at the edge of an abyss, pushing an open fisherman to its limits in a rough sea, or detailing a claustrophobic smuggler submarine. You can smell the sweat on the bad guys, and the good guys (and girls) never seem contrived. Deep Shadow is accurate, paced like an anxious thoroughbred, and highly entertaining. I can’t wait for the next one." 

“If you are looking for an exceptionally well written and narrated book of adventure, pirates, terrorists, corrupt governments and drug runners, you will be happy when you dive (pun intended) into Deep Shadow, a fulfilling action-packed thriller with depth and dimension.”