Best friends Becky and Jules open a detective agency, Investigation Duo, to help others solve their family mysteries. Their new careers turn dangerous when the first big case lands them right in the middle of a murder. But can they figure out whose greed turned deadly before they're next on a killer's list?

As a young girl, Donna Thomas tragically lost her mother and sibling. Her wealthy father has been emotionally absent ever since. As an adult, he refused to help, insisting she had to find her own way in life. When he dies, Donna’s convinced this is her chance to get what she deserves. After all, there is no other family. 

But then, his will deals her an unexpected blow. The estate is to be shared, not only with a mysterious stranger, but also a half-sister Donna didn’t know existed. It’s bad enough she has to share her father’s money, but his last words stipulate she doesn’t get a penny of her inheritance until she locates her half-sister. 

Angry and bitter, Donna turns to Becky and Jules who’ve just opened the doors of their new detective agency. Having solved family mysteries of their own, they’re now ready to help others. As they follow the trail Donna’s father left behind, it becomes clear someone else is on the hunt, as well. One accidental death in their path could be coincidental, but when it looks like the mystery beneficiary has been murdered, they don’t know who to trust. 

As Becky and Jules scramble to find the connection behind Donna’s father and the murdered stranger, they worry time is running out. If they want to find Donna’s half-sister alive, they had better find her fast because someone else seems to be one sinister step ahead of them - they want what’s theirs, and they’re prepared to kill anyone who gets in their way.