Oscar Smuff is a private detective based in Bayport. He is often to be found playing up to Chief Collig, trying to earn a place on the Bayport police force.Everyone refers to him as a so-called detective. By book #15, The Sinister Sign Post, he was a member of the Police Force.
Blissfully unaware, or unwilling to admit that his own detective skills are vastly eclipsed by the Hardy boys', he's often quick to offer them unhelpful advice on the case at hand. At one point, allowing them to watch him at work, he interprets a banal conversation between two workers about sports and sandwiches as a coded discussion of a sabotage plot. However, the boys had to feign agreement with Smuff at one point in order to help their father, who was taking a flight to Albany at 6 o'clock, and warned that if Smuff goes too, that could cause trouble. The Hardy boys work with Smuff, only for him to realize he missed his flight. Frank coolly responds, "No problem Mr. Smuff, there is a 7 o'clock flight to Albany". 
A short, stout man, he often dresses in a checkered suit and soft felt hat.
- The Hardy Boys #1 The Tower Treasure
- The Hardy Boys #6 The Shore Road Mystery
- The Hardy Boys #12 Footprints Under the Window
- ↑ 1.0 1.1 The Hardy Boys #1 The Tower Treasure (1959) p14
- ↑ The Hardy Boys #12 Footprints Under the Window (1965) ch6
- Oscar Smuff at HDA.