The Mystery of the Spiteful Letters is an installment in the Five Find-Outers and Dog series. The local community is disrupted by the arrival of mean, anonymous spiteful letters that accuse innocent people of crimes or bad behavior. The Find-Outers must use deduction and observation to discover who is writing the letters and why, requiring them to unravel a psychological mystery based on motive and handwriting analysis, testing their skills against a devious, non-physical opponent.
