Steve Brezenoff 
Stowaways [PDF ebook] 

Best friends Maya and Tucker didn’t expect to spend their spring break onboard the Titanic — in 1912. But now that they’ve discovered a special collection of artifacts has the power to send them back in time, they’re on a mission. They must travel back in time again to save their friend Liam and his parents, third-class passengers onboard the Titanic, and change history. Can they convince the captain to change the course of the doomed ship before it hits the iceberg?