General Hospital (GH) spoilers reveal that Martin Grey (Michael E. Knight) will make a mystery phone call, so that’ll lead to a bold move that shakes up Port Charles. Martin will set some chaos in motion with his sneaky strategy, so let’s talk about all the drama that’s brewing.

Back in July, Martin discovered a letter on the floor of Drew Cain’s (Cameron Mathison) house.

Since it was covered in the kids’ drawings, Drew shrugged it off as some scrap paper that Wiley Corinthos (Viron Weaver) and Amelia Corinthos (Sequoia and Serenity Mork Macko) must’ve picked up at the Quartermaine mansion.

Martin privately read that letter, which was addressed to Monica Quartermaine (Leslie Charleson) and from someone who was sorry to hear she’d been ill.

This person also indicated that it’d been a long time since they’d talked, so everything points to an estranged sibling here.

That fits with GH buzz about One Life to Live alum Erika Slezak playing Monica’s long-lost sister, so it looks like that’s who Martin will reach out to.

When Martin makes this mystery phone call that’s coming up, he will be giving Monica’s sister updates on her passing.

Of course, Martin may also give Monica’s sis a nudge to come to Port Charles – both for the funeral and for the will reading since there’s bound to be one.

Martin may have a few tricks up his sleeve when it comes to making Tracy Quartermaine (Jane Elliot) pay for some of her past actions – and he may use Monica’s sister to pull those tricks off!

Now that Martin has struck a deal with Drew regarding Stella Henry (Vernee Watson), her legal problems are hopefully over.

Martin won’t have to worry about that anymore, so he can just focus on his Tracy revenge mission and any other schemes along the way.

Naturally, there might be some financial benefits for Martin when it comes to helping Monica’s sister go after a piece of the Quartermaine pie!

Martin is broke, so that could be a motivator when it comes to stirring up trouble, too.

General Hospital spoilers say Martin will make some messes in the coming episodes, so stay tuned for all the shocking news to come.