Sink or Swim is the first book in The Magic School Bus Rides Again book series written by Samantha Brooke. It will be released on December 26, 2017. It is a part of Meet the Class. It is possibly the reboot version of The Magic School Bus Takes A Dive, and the book version of In The Swim.
The class is learning about the ocean, when Tim and Wanda ask an important question. Fiona decides she will bring them on a field trip. The kids travel to the bottom of the ocean where they must save themselves from sharks.