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Thomas has a Secret is a My First Thomas-style activity sticker book, part of the 2002 Thomas Learning Series.
Thomas refuses to leave the station, and he does not say why as it is a secret. His Annie and Clarabel, his driver and fireman, and Sir Topham Hatt keep asking him why he doesn't go. Eventually Thomas says that there is a bird on his funnel and it asked him to keep it a secret.