This was an audio book red amazingly by Jayne Entwistle, a professional narrator and (almost literally) one-time actor, who does great British voice because she's...British! She lives in the US now.
The story is a magical one in more ways than one. Lily and Oscar Spoffard move into a property their family inherits. It used to be the location of a very successful chocolate manufacturer and retailer which purveyed chocolates to royalty, until two of the talented Spoffard triplets were murdered by the other in 1938.
But there's more going on here than that. The third triplet is evidently in search of the magical chocolate molds used by his brothers, and now Lily and Oscar are tied up in the adventure, especially after they're recruited by a little known division of MI6 (the Brit equivalent of the CIA), they begin to learn their family history and of the magic that can be passed own in families - maybe to them?
The story wasn't perfect (but then which is?!). The terrorists didn't seem to end up caught, and the magical abilities the children were supposed to have never materialized in any overt form, but apart from that, the story was chock(olate) full of LOL moments, and the talking immortal cat (Demerara - great name for a cat) and the similarly endowed rat (Spike!) were hilarious. Spike was actually my favorite character, but then I have a soft spot for rats. Lily was a close second. I'd have been proud to have had a daughter like her. I thought Ms Entwistle overdid the cat's voice a touch, but overall I loved her characterizations. Her voice was to die for dahlings! I thought the story was great, and very entertaining. I shall be looking for more from this author.