Trixie is intrigued by Regan's problems and the sudden appearance of Dan Mangan, a black-jacket wearing city kid who has come to stay with Mr Maypenny. Although the Bob-Whites are busy organising an Ice Carnival to aid their Mexican pen-pals, Trixie is determined to find out why Dan is here and what is troubling Regan. When Honey's missing watch is pawned and the clubhouse is broken into, the finger points squarely at Dan. Trixie's dislike of him is evident, but when she and Bobby find themselves in trouble he is the only one who can save them