Returning from a cricket match in Ireland, Peter Weston (Sinden), an Englishman, is left with a pet alligator by another passenger who abandons it to him. Horrified, his first instinct is to get rid of it as soon as possible. However, he soon develops a bond with Moira (Carson), a young Irishwoman, which appears to be centred almost entirely around the animal. He soon discovers that Daisy is very tame and domesticated, and seems to be the way to Moira's heart.