While I love The Witches of Thistle Grove series, Stay A Spell, is not a strong addition to the series.
From Bad to Cursed is the companion and sequel to Payback's A Witch. This time we follow Isadora and Rowan who we already briefly met in the first book. When a necromatic curse is flung at a Thorn member it is up to Isa and Rowan to figure out who did it. And not kill each other in the process.