To the delight, not to say astonishment, of home fans the Seagulls produced a nailbiting finish and a final three-point result in the Carlisle Grounds this season.
Dean Shiels's quarter hour opener for the Candystripes was almost a "here we go again" moment for the Bray faithful, but when Seán Heaney equalised before the break, there was a feeling that something different might happen this time.
It took a decent shift from newly-returned home keeper Evan Moran to maintain equality until deep in time added.
And it was a Seán Harding shot that provided the opening when it was turned over by Derry keeper Eric Grimes.
Jake Kelly took the flag-kick and John Sullivan managed to bundle it into the Derry net.
Bray will travel for their last Premier Division encounter of 2018, with Cork City on Friday, in a much changed frame of mind.
Compiled by Mícheál Ó hUanacháin
Bray Wanderers: 29 Evan Moran; 25 Cian Walsh, 5 Seán Heaney , 4 Conor Kenna (c); 8 John Sullivan , 6 Paul O'Conor; 31 Seán Harding, 22 Darragh Noone, 3 Kevin Lynch; 24 Jake Ellis; 9 Gerald Pender