.. the returns are pretty damn enticing. It has a 5 star morningstar rating and 1000+ 5 star reviews.
So go back 12 months and buy in.
Otherwise, look at the portfolio, the strategy, and ask if the reasons the manager looked so great last year will be at all repeatable. There can be some momentum among winners, but more likely he has squeezed the juice out of his part of the market.