Trevor's Christmas preparations take an unexpected turn when he's left in charge of a lost baby just as a lucrative house-sitting offer falls in his lap.

After passing the house-sitter interview while keeping the rascally baby out of sight, Trevor faces his next challenge: changing nappies.

If being locked out of the penthouse and dealing with nightly intruders wasn't enough, an unfortunate mix-up leads Trevor to part with the wrong baby.

An unexpected bit of news from the penthouse owners sends Trevor into a mad scramble to save Christmas — and the baby — from disaster.