The Mystery of the White Elephant (Three Cousins Detective Club #1) by Elspeth Campbell Murphy

It's Titus, Timothy, and Sarah-Jane
from the Three Cousins Detective Club!
The three ten-year-olds are ready to
learn about the Fruits of the Spirit while
solving more exciting, adventure-filled
mysteries!

In The Mystery of the White Elephant, 
a swap meet is taking place at Timothy
Dawson's church, and the three cousins
are hoping to find the perfect "white
elephant" gift to buy. When a cookie
jar mysteriously disappears, Timothy,
Titus, and Sarah-Jane decide it's a job
for the "TCDC"! The problem is, who
in the world would steal a white
elephant?

Theme: Love