Pretty easy:

1.Qh8+ Ke7
2.Qf6+ Rxf6
3.exf6+ and the double check forces the black king onto the d-file (this or mate in 1) for a skewer after 4.Rxd4+. Probably best for black is

3.............Kd7
4.Rxd4+ Kc8

And white can get a decisive edge with 5.Rxd8, but likely will get better with 5.Bh3+ first, but I am not 100% sure of this without putting this on the board.