Sarah DeLappe is following up “Bodies Bodies Bodies,” her SXSW pic about a group of rich 20-something friends whose hurricane party turns deadly, with another dark comedy. She’s been tapped by Neon to adapt Dorothy Baker’s 1962 novel “Cassandra at the Wedding,” per Deadline.

The book follows Cassandra Edwards, “a graduate student at Berkeley: gay, brilliant, nerve-wracked, and miserable. At the beginning of the novel, she drives back to her family ranch in the foothills of the Sierras to attend the wedding of her identical twin, Judith, to a nice young doctor from Connecticut. Cassandra, however, is hell-bent on sabotaging the wedding,” the source teases.

DeLappe co-wrote Halina Reijn’s “Bodies, Bodies, Bodies,” which premiered at SXSW earlier this month, alongside Chloe Okuno (“Watcher”) and Kristen Roupenian. The slasher pic’s ensemble cast includes Amandla Stenberg (“The Hate U Give”), Maria Bakalova (“Borat Subsequent Moviefilm”), and Rachel Sennott (“Shiva Baby”).

Also a playwright, DeLappe’s play “The Wolves” was a finalist for the 2017 Pulitzer Prize for Drama and received the American Playwriting Foundation’s inaugural Relentless Award.

Baker’s other novels include “Trio” and “Young Man with a Horn.” She died in 1968.