not a specific spot, but generally: fish the bowl at coast guard Truro... walk to the right from the parking toward HOTM, there is a big bowl with a cut thrrough the peaked hill bar about 100-150 yards from the lot that often holds fish at the middle tides and high tide.
Check it out at low tide in the day and watch the wave breaks so you will know where I mean.
Fish at nite. low tide is least productive. The bowl is pretty deep, maybe 4-5 feet deeper than the surrounding slope and the bar break out beyond it helps too.