Ace on the Case: Secrets@sea invites students to solve a mystery by tracking down ecological clues in an interactive story format. As students click on bubbles, they move forward through the story. Topics woven into the mystery include food webs, bioaccumulations, killer whales, salmon, plankton, salinity, and others. There is a study room where students can click on objects to get more clues. Field Guides are divided by topic and offer additional information for students.