The Adventure of Johnnie Waverly (S01E03)

Poirot is called in to investigate a series of kidnap threats against the three year old son of a wealthy aristocrat. Once installed at Waverly Court, Poirot becomes suspicious about the child's parents - especially when the servants are suddenly dismissed. The absence of a cook forces Poirot and Hastings to look elsewhere for a decent meal which in turn leads to vital information about the planned kidnap. (iTunes)