Series numeration from Fantastic fiction.

The world's shark population is in trouble for a sad, simple reason: shark fin soup. And although it's illegal, poachers have been targeting Florida's biannual migration of blacktip sharks. Marine biologist Doc Ford needs some assistance protecting the sharks and enlists the help of three kids, Luke, Marta, and Sabina. Together they form Sharks, Inc. and are given an important assignment: to set out each day on their small fishing boat in hopes of tagging sharks for Doc's research. The trio certainly isn't looking for trouble, but when they come face to face with danger, survival requires them to rely on each of their own unique gifts, and especially on one another.