Cursed Cruise by Victoria Fulton and Faith McClaren
This book is very creepy, it follows three teenagers who are making a name for themselves going and exploring haunted places and posting what they find online. However one of them has the ability to see ghosts/spirits and that makes it all the more realistic. The group has been invited to go on a cruise of the newly renovated boat similar to the Queen Mary. As soon as they step on the boat they know something is wrong, and that it is going to be a very long cruise for everyone.
Overall this book was delightfully creepy in the only way YA can be. It has you worried for characters but knowing that they will most likely all be okay and that somehow they will figure it out in the end. While it's a bumpy ride to get to that ending, its worth it. The characters learn so much about themselves and the ghosts on this ship making such a good quick read.

Perfect for those wanting a horror book that isn't too graphic or scary.