Leaking Roof

There are drips coming into my house at the lowest point on the pitch near the front door. I don't know where it is getting under the shingles. Visually the roof looks fine, but when it rains and the snow melts, it leaks. The roof  on the house is only a couple of years old, but I don't know where the water is getting into the roof. How can I determine where the water is entering the roof, since I can't see it from inside?

As you said that your roof is only a couple of years old, then this may be a minor problem if you are not able to detect the source of problem then you must hire a roofer or you can contact to your old roofer in this way you can easily solve your problem, and a roofer can do this work much better than any one.