A sets fire by night to an inhabited house in a large town for the purpose of facilitating the…

Section 2(33) of the Bharatiya Nyaya Sanhita, 2023 (formerly section 39 IPC) says a person causes an effect voluntarily when he causes it by means he intended, or knew or had reason to believe likely, to cause it. Its illustration is this very case of setting fire by night to an inhabited house in a large town to facilitate a robbery, where A is said to have caused death voluntarily. So A is punishable for "Causing death voluntarily". He acted himself, so it is not abetment; nothing was taken, so it is not theft; and an attempt to commit robbery does not account for the death he caused.