All is not well at the Zoo-niverse. Animals are disappearing one by one. Things go from bad to worse when Joey Moose, one of the zookeepers goes missing. When Mrs Gideon reports that her python is also on the missing list, reported stolen, Howard is determined to save the day. Howard and Vince stumble across Dixon Bainbridge's secret laboratory and the terrible truth behind his 'experiments' comes to light.

In an attempt to compete with daring adventurer, Dixon Bainbridge, Howard and Vince set off in search of the Egg of Mantumbi. Into the whiteness, the nothingness of the arctic tundra, the boys come face to face with hideous ice demon, Black Frost. Luckily, Vince has befriended a polar bear.