When Gus and Gertie arrive on Holiday Island, they find a haven of seagoing scallywags, riffraff, and ruffians. It isn't long before Gertie's precious deep-sea pearl is stolen--but who's to blame? The culprit is revealed by clues cleverly hidden in Gus's hastily taken snapshots. Can readers crack the case before it's too late?Joan Lowery Nixon's mysterious high jinks and Diane deGroat's rowdy cast of characters create a fast-paced whodunit for newly independent readers.