Mystery of The Missing Car Keys

Detective Lucas helps Carl's dad find his missing car keys at the beach. The investigation involves questioning Carl and Olivia, searching for clues, and using a metal detector. Eventually, they discover that Bella, the puppy, buried the keys, mistaking the keychain ball for a toy. The mystery is solved, and the family can return home.

What did Lucas find that suggested someone was digging?

Why did Bella bury the keys according to the investigation?

What was the final outcome of the investigation?