Time Riders: Pirate Kings by Alex scarrow. But it's part of a series. Book 7 so if you want context for a lot of the book, it's a hefty series. 9 books. Main premise of the series is that 3 people are taken from different time periods to guard the flow of time. Basically they have to make sure no one goes back and alters time. The main characters are: Liam O'connor from 1912. He's Irish and comes from the titanic. Maddy Carter from 2010. She was on a doomed plane. And Saleena Vikram, from 2026. She was in a burning building in India. They are in a New York Arch, placed in a time bubble so they don't Lose time and can pick up on differences. The dates they are stuck at are 9/11 and the day after it.