Cut to the nunnery. BAM, all the nuns are dropping like flies.
Looks like Barabas's porridge has done its job.
Abigail, in her death throes, finds friar Bernadine.
She confesses everything that happened with Lodowick and Mathias: that Barabas engaged her to them both and then tricked them into killing each other.
She gives him a piece of paper which has all of Barabas's misdeeds written on it, but begs Bernadine to not tell anybody about it.
Because this is a religious confession, Bernadine is forbidden by church law to go to the authorities with the things Abigail's told him.
Abigail thanks him, asks that Bernadine convert Barabas (and thereby save his soul) and dies.
After mourning briefly that Abigail died a virgin (note: there are more dirty nun-friar jokes in this play that you can shake a stick at), Bernadine is joined by his fellow friar Jacomo.
They agree to bury the nuns and then confront Barabas.
Bernadine can't tell anyone official what Abigail told him, but he can go directly to Barabas, apparently.