Pow the Panda, The Case of the Rainbow Dragon. Stories for Demented Children, #10

In the fantastically roaring year of 1925, business is good for a hard-working private eye in Chinatown. Pow the Panda sits in his office, waiting for trouble to come through the door. He'd rather have food delivered, but it never seemed to show up before trouble did. When trouble does show up, a girl named Opal, a gorilla, a bear, a bed and bunch of bad puns join it. Pow is left with the Case of the Rainbow Dragon, but before he can solve it, he needs to find out who the Rainbow Dragon is.
The tenth story in the Odd Stories for Children series is a brisk dash through foggy streets where an endless supply of jokes trip up the journey. Caution, this story has puns. It may also contain nuts.