Roof leaks can be difficult to find and identify where the water is actually coming from as it always finds the path of least resistance and will travel for a while before finally showing up through your ceiling or beams in your roof structure. You can try to go into your attic with a light when it is raining to try and find a leak, however, the easiest and quickest way to find a problem is by having a roofing professional come out to find it and give you a quote as they will have extensive experience of where leaks are most likely to come from.