A Goodreads user
A Goodreads user asked Stuart Gibbs:

In Spy School at Sea, before the kids ventured to the nuclear reactor room to defuse the bomb in the Emperor of the Seas ship, what was the second small object Catherine had given Erica before they left? I don’t really remember—or I just hadn’t picked up on it if she had used it later on.

Stuart Gibbs I am trying to answer this without giving away any spoilers, so... Remember how, during the final action sequence, Erica had something dangerous that came in really handy? That was what her mother gave her.

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