The Professor Layton series has moved to iOS with a new spin-off starring Layton's crime-solving son. Layton Brothers: Mystery Room is available now as a free download, which includes the prologue and two cases. In-app purchases offer another seven cases to solve.

The two free cases sound pretty grim. The first case is "The Hand Sandwich," in which a woman was found murdered at a seaside hotel, with her hand resting inside a sandwich. The second, "The Bungled Burglary," features two prime suspects and a missing murder weapon. If you like those, you can get the "Case File Pack 1" with cases 3-6 for $2.99, or "Case File Pack 2" with cases 7-9 for $1.99.

You play as Inspector Alfendi Layton, with his assistant Detective Constable Lucy Baker--because Laytons always have assistants, clearly. They're members of Scotland Yard, tasked with solving the hardest cases in the titular "Mystery Room." You'll be collecting and examining evidence, noting contradictions, calling out witnesses, and then facing off against the criminals in a final showdown. You might notice that sounds a lot like Phoenix Wright, but with a police officer investigating instead of a lawyer.

Finally, the announcement promises a complete story that will reveal Layton's "secret" if you complete all nine cases. Presumably it has something to do with his brother, given the title and the fact that we've only heard about one Layton here.

You can pick up the game from the App Store. The game is requires iOS 4.3 or later and is compatible with iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch (3rd generation), iPod touch (4th generation), iPod touch (5th generation) and iPad.