Cafe owner thought her son and niece may have had something to do with Alex's death. So she concocted a story about seeing a stranger watching the kids. Meanwhile, her sister wiped all detrimental messages from her daughter to the dead child, leaving just her nephew's vile comments. Turns out that neither child could have played a part in the murder as it took place on Saturday night, not Sunday afternoon. Clear as crystal.
It's clear what's going on, but - as I said on another thread about this - the characters are all so unlikeable it's impossible to summon any interest, or care what happens to them.
I watched the first episode but gave up after 20 minutes of the second. Sound quality is appalling so I had no idea what was going on. Went over to Netflix and carried on with The Fall