K.J. Steinberg is staying in business with ABC.  The “Mistresses” creator has another soapy drama in the works at the network with “The Will,” which has landed a script commitment plus penalty, Variety has learned exclusively.

Justin Falvey and Darryl Frank of Steven Spielberg’s Amblin TV are also behind the hourlong project as exec producers with Steinberg, who’s under a deal at Sony Television, which will also produce with Good Talk Productions.

“The Will” is a mystery revolving around the surviving members of an eccentric and wealthy patriarch who dies and leaves his massive inheritance to the various members of his family, but with strict, mysterious, and sometimes bizarre conditions attached to the gifts. Each of the family member’s lives is irreversibly changed by following the instructions, leaving everyone to wonder, is the late man parenting from the grave — or using them to mete out justice and get the revenge he couldn’t get while alive?

The project also serves as a reunion for Falvey and Frank with ABC, as they are exec producers on summer series “The Whispers,” which still awaits decision regarding a second season renewal. “The Will” is the second murder mystery-type series to sell for the duo this development season, as their drama “American Gothic” landed a straight-to-series 13-episode order at CBS. Also among the pair’s projects in development is ghost town project “Centralia” at NBC and Syfy’s “Brave New World” adaptation. They’re also EPs on HBO’s upcoming President Lyndon Johnson film “All the Way,” starring Bryan Cranston.

Falvey and Frank, under Amblin TV’s banner, are exec producers on Fox’s “Minority Report” and FX’s “The Americans.” They also served as EPs on TNT’s “Falling Skies,” which just wrapped its five-season run, CBS summer series “Under the Dome,” which ended after three seasons, and the network’s Halle Berry vehicle “Extant,” which also ended this summer, after two seasons.

Steinberg, whose other TV credits include “Gossip Girl” and “Judging Amy,” recently landed a Season 4 renewal for “Mistresses” at ABC.

Steinberg, Falvey and Frank are all repped by WME.

Cynthia Littleton contributed to this report.