This is a fun, family-friendly movie about a boy and his sea serpent. No, it's not a live-action remake of Beany and Cecil. I wish! But it's still pretty good.
It's set in a remote part of Scotland—specifically, Loch Ness—during World War II. Little Angus is moody and lonely in the absence of his father, but he enjoys poking around the lochshore, picking up random bits of biology. But one day he comes across this funny egg-shaped rock. Which turns out to be an actual egg. The results are pictured on the DVD box over there on the right. (No, your right.)
There are a number of complications: a British artillery squad commandeers the manor for which Angus's mom is the caretaker. A dark mysterious stranger shows up and is hired as a handyman. Angus wants to keep his pet monster a secret from the grownups, of course—this is a requirement for all such movies—and this gives rise to a number of humorous slapstick scenes.
Acting is very good, and the effects are great. The plot is more than a bit predictable, but I didn't mind that too much. (A quick check of a map of the Loch Ness area shows that the filmmakers also got a little creative with the geography, but that's OK too.)