Books about dinosaurs, books about space and even books about dogs – Nell loves them all! But one day Peter and Nell arrive at school to find all the books have disappeared! Who could have taken them, and why? Luckily, Detective Dog Nell, with help from the whole class, is ready to sniff out the thief! When she’s not cracking cases, Nell goes to school with Peter and listens to the children read. Her ever-sniffing nose is always hard at work solving mysteries and finding all Peter’s lost toys. Peter’s dog Nell has an amazing sense of smell. She was known far and wide as Detective Dog Nell. There once was a dog with a keen sense of smell.

Her old maid mistress sees the note around her neck, and brings the police to the rescue of the detective, who is found almost dead.When a crime needs solving, there’s only one dog for the job! Join Nell the Detective and help solve the mystery of the missing books. In the meanwhile, the cat strays back to her home. Presently, he is overcome by the fumes of the gases with which the gang had filled his room. After a space, Harper begins struggling, desperately trying to fight off asphyxiation.

Soon the cat leaves, and the window automatically closes air-tight. Harper scribbles a note, and ties it to the collar of the cat. On the sill of this window, the detective finds a cat. The only outlet is a small grated window near the ceiling of the room. He eventually finds himself in a room closed in by automatic doors. The clerk, however, is on his guard, and, knowing that he is under surveillance, encourages the detective to enter the den of the criminals.

After close watching, he shadows the clerk to the den of the criminals. Lewis gets back to his office he calls in the services of Detective Harper, who, after a thorough investigation, finds a clue which leads him to suspect the clerk. I don’t know if this picture survives or not but here’s some of the synopsis published in Moving Picture News: Obviously, a heroic cat is much rarer in cinema than a heroic dog, so this makes things doubly intriguing. So, at one point in film history, there was a pair of pictures that featured a hapless detective being rescued by a pet.

The detective dog